2.5 Conversion ....Injectors?? MAF?? ECU??
06 November 2007, 07:10 PM
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2.5 Conversion ....Injectors?? MAF?? ECU??
With the current exchange rate with the US$ i'm considering doing a 2.5 conversion over the winter.
My car (MY00 uk turbo) is currently aorund 350bhp with FMIC, VF34, 6 Speed Box and other supporting mods.
I would like to go for a 2.5 short motor with forged pistons and steel rods, sti 5/6 heads, and an MD321T turbo.
What size injectors would i need for this setup?
Can the 99/00 MAF sensors handle this much air flow?
Is the ECU capable of supporting this level of tunning?
My car (MY00 uk turbo) is currently aorund 350bhp with FMIC, VF34, 6 Speed Box and other supporting mods.
I would like to go for a 2.5 short motor with forged pistons and steel rods, sti 5/6 heads, and an MD321T turbo.
What size injectors would i need for this setup?
Can the 99/00 MAF sensors handle this much air flow?
Is the ECU capable of supporting this level of tunning?
06 November 2007, 07:43 PM
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If your looking for around the 450 bhp mark, then 740cc injectors will be ideal, I have them in mine running the standard ECU (with Ecutek) and idle is no different to when the 440's were in there, the Maf was close to it's limit when mine was being tuned but I'm sure it can be rescalled accordingly, the Maf itself is in a 90mm housing which can flow more than enough air.
Mine currently has no problem with the Maf, but ultimately I will be upgrading to a Mafless ECU or Power FC with MAF SIM conversion.
Mine currently has no problem with the Maf, but ultimately I will be upgrading to a Mafless ECU or Power FC with MAF SIM conversion.
06 November 2007, 07:58 PM
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If your looking for around the 450 bhp mark, then 740cc injectors will be ideal, I have them in mine running the standard ECU (with Ecutek) and idle is no different to when the 440's were in there, the Maf was close to it's limit when mine was being tuned but I'm sure it can be rescalled accordingly, the Maf itself is in a 90mm housing which can flow more than enough air.
Mine currently has no problem with the Maf, but ultimately I will be upgrading to a Mafless ECU or Power FC with MAF SIM conversion.
Mine currently has no problem with the Maf, but ultimately I will be upgrading to a Mafless ECU or Power FC with MAF SIM conversion.
I see your using a Rotated GT30 setup on yours, nice
06 November 2007, 09:58 PM
#5
Have just done this myself.
I have gone for an externally wastegated rotated GT30R with 0.82 exhaust housing, 740cc injectors, Apexi power FC and running maf.
It hasn't been mapped yet and is running rich as hell but overall and based on first impressions I am delighted with my setup.
Car is a 1999 classic with STI version 5 heads and a UK six speed.
It pulls like a train but is also very very driveable. At the moment fuel economy is dreadful but i'm putting that down to the mapping situation.
I have gone for an externally wastegated rotated GT30R with 0.82 exhaust housing, 740cc injectors, Apexi power FC and running maf.
It hasn't been mapped yet and is running rich as hell but overall and based on first impressions I am delighted with my setup.
Car is a 1999 classic with STI version 5 heads and a UK six speed.
It pulls like a train but is also very very driveable. At the moment fuel economy is dreadful but i'm putting that down to the mapping situation.
06 November 2007, 11:41 PM
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Been thinking about doing this myself and have been looking all over the net for prices and the best iv seen so far is about £1400 with out delivery.
Had a talk with a tunner over here and he said he could bild me one for £1700 so what is the point of getting it from the states when it cost about the same price here these days?
Had a talk with a tunner over here and he said he could bild me one for £1700 so what is the point of getting it from the states when it cost about the same price here these days?
07 November 2007, 06:20 AM
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Been thinking about doing this myself and have been looking all over the net for prices and the best iv seen so far is about £1400 with out delivery.
Had a talk with a tunner over here and he said he could bild me one for £1700 so what is the point of getting it from the states when it cost about the same price here these days?
Had a talk with a tunner over here and he said he could bild me one for £1700 so what is the point of getting it from the states when it cost about the same price here these days?
I would check what Spec the engines are first before you campare prices, i.e what rods, bearings & Pistons etc
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07 November 2007, 06:53 AM
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Have just done this myself.
I have gone for an externally wastegated rotated GT30R with 0.82 exhaust housing, 740cc injectors, Apexi power FC and running maf.
It hasn't been mapped yet and is running rich as hell but overall and based on first impressions I am delighted with my setup.
Car is a 1999 classic with STI version 5 heads and a UK six speed.
It pulls like a train but is also very very driveable. At the moment fuel economy is dreadful but i'm putting that down to the mapping situation.
I have gone for an externally wastegated rotated GT30R with 0.82 exhaust housing, 740cc injectors, Apexi power FC and running maf.
It hasn't been mapped yet and is running rich as hell but overall and based on first impressions I am delighted with my setup.
Car is a 1999 classic with STI version 5 heads and a UK six speed.
It pulls like a train but is also very very driveable. At the moment fuel economy is dreadful but i'm putting that down to the mapping situation.
07 November 2007, 07:01 AM
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Been thinking about doing this myself and have been looking all over the net for prices and the best iv seen so far is about £1400 with out delivery.
Had a talk with a tunner over here and he said he could bild me one for £1700 so what is the point of getting it from the states when it cost about the same price here these days?
Had a talk with a tunner over here and he said he could bild me one for £1700 so what is the point of getting it from the states when it cost about the same price here these days?
Very much doubt i could get one built in the UK for close to that sort of money, who quoted you £1700?? and what spec was it for??
07 November 2007, 07:33 AM
#10
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SimTek ecu and 740cc injectors should suit your needs perfectly...
Map based system so no need for MAF or MAFSIM , switchable maps for different fuels ideal for those that splash meth occasionally , full closed loop in gear boost control and optional extras like antilag and launch control...
Map based system so no need for MAF or MAFSIM , switchable maps for different fuels ideal for those that splash meth occasionally , full closed loop in gear boost control and optional extras like antilag and launch control...
07 November 2007, 09:48 AM
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With the current exchange rate with the US$ i'm considering doing a 2.5 conversion over the winter.
My car (MY00 uk turbo) is currently aorund 350bhp with FMIC, VF34, 6 Speed Box and other supporting mods.
I would like to go for a 2.5 short motor with forged pistons and steel rods, sti 5/6 heads, and an MD321T turbo.
What size injectors would i need for this setup?
Can the 99/00 MAF sensors handle this much air flow?
Is the ECU capable of supporting this level of tunning?
My car (MY00 uk turbo) is currently aorund 350bhp with FMIC, VF34, 6 Speed Box and other supporting mods.
I would like to go for a 2.5 short motor with forged pistons and steel rods, sti 5/6 heads, and an MD321T turbo.
What size injectors would i need for this setup?
Can the 99/00 MAF sensors handle this much air flow?
Is the ECU capable of supporting this level of tunning?
The biggest problem I have had is the MAF issue.(with bigger pipework surge and stall are a real pain and caused 3 MAF failures)so I went down the SIMTEK ecu route which has got rid of the MAF.
Now without the compressor stall I feel that my car has better and more linear power.My injectors are variable and can flow way past my requirements.
All of the work was done by API so I would suggest you have a chat with David who will explain your options.
07 November 2007, 12:51 PM
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Slow-boyracing.co.uk
His own car has 600+ bhp and im sure he said that whould be with Forged Pistons. Give them a call "neil" Really nice and helpfull guy
Last edited by Going 4 400bhp; 07 November 2007 at 09:00 PM.
07 November 2007, 01:40 PM
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With the current exchange rate with the US$ i'm considering doing a 2.5 conversion over the winter.
My car (MY00 uk turbo) is currently aorund 350bhp with FMIC, VF34, 6 Speed Box and other supporting mods.
I would like to go for a 2.5 short motor with forged pistons and steel rods, sti 5/6 heads, and an MD321T turbo.
What size injectors would i need for this setup?
Can the 99/00 MAF sensors handle this much air flow?
Is the ECU capable of supporting this level of tunning?
My car (MY00 uk turbo) is currently aorund 350bhp with FMIC, VF34, 6 Speed Box and other supporting mods.
I would like to go for a 2.5 short motor with forged pistons and steel rods, sti 5/6 heads, and an MD321T turbo.
What size injectors would i need for this setup?
Can the 99/00 MAF sensors handle this much air flow?
Is the ECU capable of supporting this level of tunning?
I would go Simtek or have a look at Haltech ECU's
If your going above 450 / 450 on the 2.5 then consider rods & pistons
MD321T will see you around 475+ HP and no need for external wg or rotated pipes which are all expensive
I have a nice set of professionally ported STi 5 heads and new kents cams that will go lovely with a 2.5
07 November 2007, 08:33 PM
#14
It seems to be coping fine at 1.45bar. I used to have stall issues when coming to a junction but it has settled down and hasn't done it for a couple of weeks now.
Like i said though its rich as hell so with a little less fuel and a tad more timing it should make a vast difference.
Time will tell but at the mo its all looking very promising.
07 November 2007, 10:55 PM
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The price quoted was "around" £1700 to Ashford as part of a grander scale project, it included Drop in pistons and no other internal work on the block.
We do have various options available at competitive prices feel free to contact me.
08 November 2007, 05:16 AM
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[QUOTE=turboDean;7391197]I can get one with Forged Pistons and Rods and uprated Bearings for $3000 (about £1450) inc delivery, just have to pay duty/vat on top.QUOTE]
Were is this price from? Do you know of a web page on it?
Were is this price from? Do you know of a web page on it?
09 November 2007, 07:49 PM
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10 November 2007, 02:36 PM
#20
To be totally honest I'm not even sure that the MAF was to blame as I found a dodgy earth that was intermittent. Since I have sorted that issue it hasn't once stalled.
I reckon i'm on borrowed time as I havent had the car mapped for the 2.5 and the GT30R its running the 2.0L and VF28 map still. I've upped the fuel pressure on the reg and the maf seems to be coping and doing its job really well. I'm giving the car a pretty hard time at the moment and its just getting quicker and quicker.
Injector duty is peaking at around 93% on the 740cc injectors highest knock reading i've had is 23 and it just pulls like a train in every gear. Boost peaks at 1.3 in first its a six speed box so i have to change very quickly.
The only complaint i have at the minute is that the car is dreadful on fuel economy.
I'm judt hoping that I'm not wasting monry when i have it mapped as I would like to see a healthy gain performance wise.
Daz
I reckon i'm on borrowed time as I havent had the car mapped for the 2.5 and the GT30R its running the 2.0L and VF28 map still. I've upped the fuel pressure on the reg and the maf seems to be coping and doing its job really well. I'm giving the car a pretty hard time at the moment and its just getting quicker and quicker.
Injector duty is peaking at around 93% on the 740cc injectors highest knock reading i've had is 23 and it just pulls like a train in every gear. Boost peaks at 1.3 in first its a six speed box so i have to change very quickly.
The only complaint i have at the minute is that the car is dreadful on fuel economy.
I'm judt hoping that I'm not wasting monry when i have it mapped as I would like to see a healthy gain performance wise.
Daz
10 November 2007, 05:55 PM
#21
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A 2.0 VF28 map is unlikely to be scaled high enough to match the airflow you will see on a GT30R/2.5 I'd be careful if I were you Daz !
The 99/00 maf can be reliable if mounted correctly and filtered properly, however on a 450+ 2.5 build then I would suggest either a mafless ECU or a blow through newage maf conversion on an Apexi, have done a few of these now on P1's and Sti5's and it works very well with none of the blow-back on liftoff issues normally associated with a FMIC/Maf combo.
Andy
The 99/00 maf can be reliable if mounted correctly and filtered properly, however on a 450+ 2.5 build then I would suggest either a mafless ECU or a blow through newage maf conversion on an Apexi, have done a few of these now on P1's and Sti5's and it works very well with none of the blow-back on liftoff issues normally associated with a FMIC/Maf combo.
Andy
10 November 2007, 07:22 PM
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The 99/00 maf can be reliable if mounted correctly and filtered properly, however on a 450+ 2.5 build then I would suggest either a mafless ECU or a blow through newage maf conversion on an Apexi, have done a few of these now on P1's and Sti5's and it works very well with none of the blow-back on liftoff issues normally associated with a FMIC/Maf combo.
Andy
Andy
Can this be done with the standard ECU or does it have to be an Apexi?
10 November 2007, 08:13 PM
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The cars usually come to me with it already done so I don't have the wiring details here I'm afraid. Basically the newage MAF is a small bolt in unit that can be fitted in the intercooler > throttle body pipework, ideally in a straight section of 75mm+ bore in order to allow enough resolution.
It can be done on the original ECU but its not ideal due to limited access to accelleration enrichment maps on the 99/00.
Andy
It can be done on the original ECU but its not ideal due to limited access to accelleration enrichment maps on the 99/00.
Andy
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