Boost Pressure.

S

Sigma

Member +
Really quite zoned out by the whole issue of what I can actually turn my boost to safely now with the car guys.

The spec is :-

4E, Standard Internals, with good compression and new big ends.
0.6mm TRD H/G
5thou skimmed from the head
3thou skimmed from the block
WEPR CT9 Replacement Manifold
CT9B, Ported Wastegate
HKS Actuator
ZEP 3" Downpipe
Straight through, full length HKS exhaust.
Filter off Turbo, with huge cold air feed.
HDi Intercooler Kit
JAM Racing ECU

It's currently set on the adjustable actuator, at about 0.90-0.95bar, and it pulls like a train, set at 10deg BTDC on V-Power.

Been told by several people, that the ECU will have been mapped to well over 1.0bar, and that I can simply adjust the boost ceiling to 1.2bar, reset the ECU, and it'll not mind?

Has anybody got a definitive answer?

Thanks in advance, Tommy :)
 
GTnomez

GTnomez

Member +
The JAM ecu will adjust itself but not straight away though so yes it should fuel for it as it is a self learning ecu.

Also you have a ct9 so no need to go that high unless you have one of your magical ones!

Maybe unrelated but a 0.6 HG raises CR right?
 
dac69er

dac69er

Super Moderator
i would be wary of running even a bar with the compression raised like it is on stock internals.

i would take it to the rollers and get it checked for detontation before uping the boost. why did you go for a thinner headgasket with stock pistons? especially as you have had the head skimmed!!!!!!
 
A

ALaN

Member +
I would get compression checked and go from there but on the other hand anything more than a bar on a stock ct9 and your gonna be blowin a load of hot air into your engine (fmic or not).
You'll just be over working the turbo.
Alan
 
D

DavidAshton

Member +
I run 1.2 bar on a ct9 and a plug n play ecu daily.

Its a significant difference to running just a bar, 1.2 bar all the way imo also made 204.4bhp at that boost.
 
Phil

Phil

Super Moderator
lad your going to blow that car up.

listen to duncan.

skimmed head and block and 0.6mm hg? = high compression.

you saying its a good engine with "good compression" means nothing what are you comparing it to? 180psi? your running a high comp engine, it relates to nothing that will be churned out of the tggt tech section of "good compression figures".

ALSO the jam/blitz and def the mines ecu are known for making whatever power they manage by having aggressive timing maps and rich fuelling.

so what you have is a high comp engine running a chipped ecu for a low comp engine which is not adjustable, and even if the AFR is alright or even rich the engine could/will still det itself into a number of pieces with all that advanced timing,

its time to pray the ecu can pull enough timing back when the knock sensor goes daft first time you bring it on boost.

Phil
 
Last edited:
D

DavidAshton

Member +
Sorry my post did not take into account a high compression set up.

And yeah i think we are all like it in Rotherham, Glanza D runs silly boost on a standard block with a td04 kit too lol.
 
A

ALaN

Member +
DavidAshton said:
I run 1.2 bar on a ct9 and a plug n play ecu daily.

Its a significant difference to running just a bar, 1.2 bar all the way imo also made 204.4bhp at that boost.
Click to expand...

Well mine showed 201bhp at 1bar in a ct9b so it just shows what that extra hot air is doing for you haha.


If you run alot of boost with high comp you can say goodnight to some internal parts.
Get a standard headgasket back on her as the skimming of the head and block will act just like having the trd 1 fitted.
 
Sheldon

Sheldon

Malta Area Rep.
ALaN said:
Well mine showed 201bhp at 1bar in a ct9b so it just shows what that extra hot air is doing for you haha.


If you run alot of boost with high comp you can say goodnight to some internal parts.
Get a standard headgasket back on her as the skimming of the head and block will act just like having the trd 1 fitted.
Click to expand...

unless he doesnt run much boost and puts an eye on det. but defo not with a JDM ecu.. aftermarket programable one for sure.
 
A

ALaN

Member +
Yeah agreed on the managment side if things, I love my blitz access but it will eventually hold me back too.
Alan
 
S

Sigma

Member +
Well, at the minute it appears to be running pretty much alright, having not had the fuelling checked and with the static timing in the standard position.

The compression is now, after at least 5 minutes of fondling a calculator, 9.17:1

I thought that the response was up slightly :p
 
Chris@CCM

Chris@CCM

Member +
u need to get it checked for det and the fueling checked ive seen them det at pretty low boost once the cr is up abit
 
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