Im running a 2.5 with all supporting mods and the best I can get is 432/440 runnuing 1.8bar on Vpower, I see a lot of md321 owners with way over 450+ with same spec as me only differance is turbo. So are any other 475+ owners getting what was said on the tin if you know what I mean .


Cheers Dougie

 

Is the bigger power and torque not on AVCS heads ???

 

Dont know Steve, I am begining to think it's maxed out as turning up the boost is just getting more torque but no power. Would love to know if other people are getting the figures.

Cheers Dougie

 

Have you considered just mapping on methanol as that will give you more power

 

we got 429 @ 1.5 on a 2.5 the owen/forge actuator was weak and it wouldnt hold its boost we junked that and fitted a garret one from burtons and it made so mutch more boost it grenaded the motor ...check your actuator !!!
that was on regular super unleaded....JGM mapped it and thought with a better actuator it would see 480 + unfortuanatly never got the chance....

 

I doubt changing the actuator will help, if Dougie is already running 1.8bar, and is still able to turn the boost up !

If turning the boost up doesn't increase BHP, then it's likely the turbo flow is maxed out, for the given set up.

 

Doug,
Have a chat with Tracktive Solutions, as they have done a fair bit of testing on this turbo. Would be interesting for you to then compare specs of what Richard Bulmer has seen. Something could be amiss with your set-up.

 

Hi Mark, you maybe right about the air flow as my turbo is in the standard position as per my94 with the 90 degree bend, I have thought about rotating it to increase air flow. Do you think this will be a good option?

Thanks for all the help guys


Dougie

 

admitedly the turbo i have is the one that tractive had speced from owen for their own car. Shurly just raising the ph1 manifold on spacers and fitting a front entry pipe would be easier than rotating the turbo or just fit a 1.5 manifold and front entry pipe

 

The turbo was bought through Tracktive and was supplied with a 1 bar actuater as specified by Richard, I dont think that is the problem as it holds.
1.8bar all day. But as you said with your 429@ 1.5bar mine was 430@ 1.6bar so not much difference


Cheers for the reply

Dougie

 

I know what your saying but I also have to move the power steering pump so thought it might be easier to rotate, mmm what should I do

Dougie

 

I guess if you can weld or have acess to someone who can its not a bad option.........just if i was going to that id probably get a bigger turbo
The actuator mine was supplied with wouldnt hold more than 1.3 but with the new actuator it would hold 2 bar it wasnt mapped for 2 bar so the motor melted nothing ventured nothin gained i guess

 

Why wouldnt the actuator hold more than 1.3 bar ? If you have a 3 port solenoid, avcr or ecu with decent boost control then the actuator will only see the pressure that you allow it to see and will hold whatever you ask of it (if the turbo is capable of flowing the air).

 

Didn't many big horsepower MD users mostly use methanol to "top-up" their BHP figures ? iirc

DunxC

 

it wouldn't flowing the air at the top.. it tailed off..

suggestion was a stronger actuator might help.. but obviously would need mapping for as he demonstrated

Simon

 

bugger

 

Mine made 420bhp @ 1.6bar on a 2.0l on a dyno dynamics rolling road, my car was run in 3rd gear not 4th for some reason so might make a touch more, i am only on the stock engine though, i think these turbo's would struggle to make 475bhp

 

was looking at one of these turbos,dont think i will bother now

 

I can't comment on the Owen turbos because I have no experience of them, but I would start with talking to Tracktive, who supplied/spec'd the turbo, and I assume mapped the car to.


A 90 degree bend on the front of the turbo isn't ideal, but IIRC the Owen turbo uses a 76mm intake, and that should be more than sufficient to flow the air you need, even with a 90 degree bend.

With regard to the PS pump, it doesn't have to be moved, you just need to fit the later PS header tank, 97-99, or the new age remotely mounted version. You'll have to do a couple of other things, but it's not too difficult.


As for the MD321T, it commonly makes circa 450bhp @ 1.6bar on a well set up 2.5lt running V Power. It can do better on a methanol mix, but will mainly benefit from an increase in torque.

VVT heads have a bigger effect on spool up, & torque, rather than power. Although some MY heads/cams work better than others.


Mark.

 

well for a while it was awesome

 

lol..

 

i have one of these turbos and i am slightly concerned that it will not produce the goods as it were!
mine will be going on a forged 2.5 with flowed V4 Sti heads, 740's, GT Spec headers etc and i am wanting 450 at least!

annyone else got anything to add?

 

I'm curious....

"If I turn up the boost I get more torque, not horsepower".
Torque is the tractive effort the engine produces to accelerate the car, so this is a good thing ?

dunx

Thinks 450 bhp from a 2.1 + MD321H is fine by me.... (Soon !)

 

you were already told to speak to Tracktive solutions they have used this turbo on their own car so they should know..........

 

I dont know what you thought I said but I havn't replied on this thread in ages

Anyway a bit of an update

My car had been doing my head in for a few months now as on each dyno I have been getting 430/430 on vpower, I know what your thinking its enough which it is lol BUT I originally got the engine out of Neil's EMB classic and he got 453/450 lb/ft and Ive been chasing those figures for over a year and after all the this time I realised the backbox on my buddy club system was restricting the flow, so I sourced an identical backbox through Jetex which was 3" to match the rest of the exhaust.
Anyway I went to the dyno today with Antony of A.D.Edmundson mapping services and after a bit Edmy's trickery it managed 453.5/453.4lb/ft so as you can tell im really happy with the results. I still think it would be very hard to get 475+ out of this turbo but it defo does 450bhp so it cant be that bad

Here is are a couple of pics of the dyno run on one run it managed 470lb/ft :twisted:


Big thanks to Edmy for your time today roll on drag racing next year with race fuel and a cheeky 50bhp shot of nitrous, should see the high 10s



Cheers Dougie

 

VERY NICE !

Not quite related, but I've just removed a sports-catted std bore system, and fitted a 3" de-cat by APS, and it's noticeably quicker before re-mapping.

So much so my clutch has started slipping !

LOL

dunx

 

All I did was change the backbox and put it back on the same rollers and I went from 432/432 to 436/470 and that was without changing the map so could have a good bit more in yours now you removed the cat.



Cheers Dougie