What is the Peak Boost on STI 7 / 8
08 June 2003, 05:41 PM
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STI 8 PPP
1.44bar peak boost as indicated on my SECS Unit
I reset the unit to see if this was just a spike in the boost but its repeatable.
Phil G
edited to add
I have had the car on the rolling road when the car had 2.5k on the clock and got peak power of 311bhp,
[Edited by philgr - 8/6/2003 5:43:30 PM]
1.44bar peak boost as indicated on my SECS Unit
I reset the unit to see if this was just a spike in the boost but its repeatable.
Phil G
edited to add
I have had the car on the rolling road when the car had 2.5k on the clock and got peak power of 311bhp,
[Edited by philgr - 8/6/2003 5:43:30 PM]
06 August 2003, 08:48 AM
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When I had my STI7 I put on a rolling road last November, as standard it was spot on the 1.2bar. I expect the STI8 to be exactly the same. (my STI 8 hasn't done enough miles yet to go on a rolling road)
Chris
Chris
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08 August 2003, 10:28 AM
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It seems that most everyone claiming high boost figures (>1.35 bar) are using SECS. This relies on a conversion in the ECU and another one in the SECS unit. Does anyone with SECS also have access to a reliable boost gauge since the differences we are seeing seem unreasonable. Maybe the SECS unit is catching a very brief boost peak invisible to an analogue gauge.
Can anyone confirm official figures for STi7/8. Don't think PPP makes any difference here.
Can anyone confirm official figures for STi7/8. Don't think PPP makes any difference here.
08 August 2003, 10:41 AM
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STi8 MATE,
Up untill recently i was using both SECS and Defi's. On my Sti8 PPP i see a peak of 1.46 on the SECS, i was seeing around 1.5 on the Defi's.
Simon
Psi3
[Edited by PCB - 8/8/2003 10:42:32 AM]
Up untill recently i was using both SECS and Defi's. On my Sti8 PPP i see a peak of 1.46 on the SECS, i was seeing around 1.5 on the Defi's.
Simon
Psi3
[Edited by PCB - 8/8/2003 10:42:32 AM]
08 August 2003, 11:39 AM
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just seems very high for a standard boost setting, 1.5 is what a lot of the people have turned theres up to with a boost controller and have held it with a boost solinoid !! must be somthing wrong with my car as it has turbo back system RSK and a BOV and i can still only see 1.2 bar at peak ??? can ayone enlighten me on this or is this maybe due to the turbo diffrences between a 7 and an 8
08 August 2003, 06:51 PM
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I have both SECS and STi Defi's installed and they read exactly the same, there is a known issue with overboost on JDM cars, this may read across to some STi UK's so I'm not suprised to hear of these figures in the mid range especially with a decat, a remap will increase boost as part of the upgrade normally.
10 August 2003, 06:13 PM
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Bought my STI7 March 2002, could hit 1.45-1.5 bar peak on my Defi's pretty much all through the year.
Just this last week, the weather has been hot and the car has felt like its holding back a touch, but still peak boost was at 1.45 bar just the other day when outside temps were readin 27degs.
Forgot to say, boost peak was the same standard as it is now with PPP. It just hits it lower down the revs with PPP and holds higher throught the revs slightly longer...
Simon
Just this last week, the weather has been hot and the car has felt like its holding back a touch, but still peak boost was at 1.45 bar just the other day when outside temps were readin 27degs.
Forgot to say, boost peak was the same standard as it is now with PPP. It just hits it lower down the revs with PPP and holds higher throught the revs slightly longer...
Simon
11 August 2003, 12:15 PM
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Guys
How can we get to the bottom of this? There appears to be two different settings in use, namely around 1.25 bar max and around 1.45 bar max. PPP is not a factor, decat. is not a factor nor are downpipes changes. Cars of the same build are returning quite different boost figures. I believe mine works much as Bob Rawle has suggested with about 1.28/1.21 max. So how can we explain the 1.45 figures reported by many here on the BBS.
OK what I mean is how do we join the 1.45 club.
How can we get to the bottom of this? There appears to be two different settings in use, namely around 1.25 bar max and around 1.45 bar max. PPP is not a factor, decat. is not a factor nor are downpipes changes. Cars of the same build are returning quite different boost figures. I believe mine works much as Bob Rawle has suggested with about 1.28/1.21 max. So how can we explain the 1.45 figures reported by many here on the BBS.
OK what I mean is how do we join the 1.45 club.
11 August 2003, 02:26 PM
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STi8 Mate
I wouldn't worry too much about the difference in boost figures.
My car has always boosted up to 1.45 bar, and I do have a number of recorded peaks at 1.5bar as well, but it certainly doesn't hold their for long. When we talk about holding before tapering off in the higher revs, we are probably about the same...
To give you another example, my car was rolling roaded at Well Lane earlier this year, recorded 311bhp at 1.5 bar boost... And this was not on my Defi's, this was Well Lanes own boost gauge which they hook up to the manifold instead. Also, my mate has an Audi TT, which has been Revotech'd and the same rolling road showed 259bhp. On the road, there is nothing between our cars. 80mhp - 150mhp, exactly the same. 0-80, I pulled about a car and a half length out on him, which in time speak, this isn't much. Cars way about the same from memory, 1460kg.
I do remember Bob Rawle looking at the chart on the wall, paying particular attention to my boost figures, saying something along the lines of "1.5 bar, that's intersting". I never did get chance to introduce myself and ask him what he meant by this???
Maybe he could shed some light now...
Either way, my old MY00 which was set to run 1.15bar boost peak always felt quicker than this car. In the STi though, it is deceiving with the 6 speed box, which makes you feel like you are always flying, until you look at the speedo...
Cheers
Simon
I wouldn't worry too much about the difference in boost figures.
My car has always boosted up to 1.45 bar, and I do have a number of recorded peaks at 1.5bar as well, but it certainly doesn't hold their for long. When we talk about holding before tapering off in the higher revs, we are probably about the same...
To give you another example, my car was rolling roaded at Well Lane earlier this year, recorded 311bhp at 1.5 bar boost... And this was not on my Defi's, this was Well Lanes own boost gauge which they hook up to the manifold instead. Also, my mate has an Audi TT, which has been Revotech'd and the same rolling road showed 259bhp. On the road, there is nothing between our cars. 80mhp - 150mhp, exactly the same. 0-80, I pulled about a car and a half length out on him, which in time speak, this isn't much. Cars way about the same from memory, 1460kg.
I do remember Bob Rawle looking at the chart on the wall, paying particular attention to my boost figures, saying something along the lines of "1.5 bar, that's intersting". I never did get chance to introduce myself and ask him what he meant by this???
Maybe he could shed some light now...
Either way, my old MY00 which was set to run 1.15bar boost peak always felt quicker than this car. In the STi though, it is deceiving with the 6 speed box, which makes you feel like you are always flying, until you look at the speedo...
Cheers
Simon
11 August 2003, 04:01 PM
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YorkshireSimon
I would agree with most of what you say, except my boost falls away from 1.25 fairly steadily. The Lamco gauge is well damped but I don't think I get anywhere near 1.45 bar. I for one would appreciate further learned comments from Bob or one of the Prodrive boys to clear matters up.
I also agree with what you say at the end about the STi (PPP or not). The midrange is good, but enters suddenly then fades out a bit sometimes. Temperature and fuel seem to play a role here but there is no denying the engine does'nt really pull smoothly beyond say 5800RPM. There is also an accompanying vibration/harshness at these engine speed which is not at all pleasant. I would go as far as saying the change indicator is not needed after 2nd or 3rd gear. The engine rarely wants to pull to the red line and mechanical sympathy at the harshness usually forces an early shift than perhaps should be the case.
I would agree with most of what you say, except my boost falls away from 1.25 fairly steadily. The Lamco gauge is well damped but I don't think I get anywhere near 1.45 bar. I for one would appreciate further learned comments from Bob or one of the Prodrive boys to clear matters up.
I also agree with what you say at the end about the STi (PPP or not). The midrange is good, but enters suddenly then fades out a bit sometimes. Temperature and fuel seem to play a role here but there is no denying the engine does'nt really pull smoothly beyond say 5800RPM. There is also an accompanying vibration/harshness at these engine speed which is not at all pleasant. I would go as far as saying the change indicator is not needed after 2nd or 3rd gear. The engine rarely wants to pull to the red line and mechanical sympathy at the harshness usually forces an early shift than perhaps should be the case.
11 August 2003, 04:13 PM
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In recent weeks, I would say temps have definately played a part in my cars performance.
I don't think fuel is an issue on my car, but you never know!!! I have always run Optimax on my car, and have stuck with it since being recommended this by chaps at Prodrive, as this was the fuel they used when developing the PPP.
That said, I haven't tried any other fuel since PPP. I used to use BP Super before and this seemed a very good quality fuel. Maybe I should give an alternative fuel a try and see what happens?? Or maybe even an ECU reset, although I think this is less needed on the newer cars than what it did on the older ones.
I like you get depressed at times at the cars performance, or lack of it. And every time I have a performance low point, I look on Auto Trader
The most annoying thing is, for the sake of our warranty, there is nothing else we can do to spruce things up a little. I for one would love to get that proper boxer sound back that I used to have on my MY00 with the HKS exhaust...
Maybe a change in car is needed afterall... Where did I see that Skyline again
Cheers
Simon
I don't think fuel is an issue on my car, but you never know!!! I have always run Optimax on my car, and have stuck with it since being recommended this by chaps at Prodrive, as this was the fuel they used when developing the PPP.
That said, I haven't tried any other fuel since PPP. I used to use BP Super before and this seemed a very good quality fuel. Maybe I should give an alternative fuel a try and see what happens?? Or maybe even an ECU reset, although I think this is less needed on the newer cars than what it did on the older ones.
I like you get depressed at times at the cars performance, or lack of it. And every time I have a performance low point, I look on Auto Trader
The most annoying thing is, for the sake of our warranty, there is nothing else we can do to spruce things up a little. I for one would love to get that proper boxer sound back that I used to have on my MY00 with the HKS exhaust...Maybe a change in car is needed afterall... Where did I see that Skyline again
Cheers
Simon
11 August 2003, 07:11 PM
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Simon
Oh dear its not that bad is it? Things sound almost suicidal. What you need is full tank of 100RON, a sack of dry ice for the intercooler and a nice interesting road.
With power (torque really) you 'get used to what you got'. The fact is 'you got more than a lot'. But its never enough.
At least your in the 1.45 club.
Oh dear its not that bad is it? Things sound almost suicidal. What you need is full tank of 100RON, a sack of dry ice for the intercooler and a nice interesting road.
With power (torque really) you 'get used to what you got'. The fact is 'you got more than a lot'. But its never enough.
At least your in the 1.45 club.
11 August 2003, 07:34 PM
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Decat will make a huge difference to boost peaks if not mapped around. Just decatting a car with the stock maps will see peaks of around 1.5 bar.
Does the SECS monitor knock correction figures too? I've seen (quite) a few STi7's that pulled timing somewhere between 4k5 and 6k.
Richard
Does the SECS monitor knock correction figures too? I've seen (quite) a few STi7's that pulled timing somewhere between 4k5 and 6k.
Richard
12 August 2003, 02:31 AM
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20.5 psi peak holding 18 psi to 7400 rpm read off of a greddy profec e which agreed with the Phantom Boost guage. Outside air temp (OAT) is around 32 degrees celcius during the day and we are close to sealevel.
All this at WOT in fourt and fifth gears.
Running a decatted H&S style downpipe with full 3 inch internal diameter exhaust.
Hope this helps
All this at WOT in fourt and fifth gears.
Running a decatted H&S style downpipe with full 3 inch internal diameter exhaust.
Hope this helps