When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
General Car Related Discussion.To discuss anything that is related to cars and automotive technology that doesnt naturally fit into another forum catagory.
Just Looking for help from more knowledgeable people on here,
Just got my zetec turbo capri back from mapping,
And its shit it makes 315bhp but at 6900 and 14psi and's gutless low down
spec is st170 engine JE pistons arrow rods, 9;1 compression(suspect may be less) custom inlet (homemade)
homemade tubular exhaust manifold
Garrett GT2871R with a TiAL vband .63 housing
would fitting smaller turbine housing or shorter exhaust manifold shift spool and power lower down the Rev range,
Or any other suggestions would be great
local Rolling road mapped it( there not exactly common in south of ireland) and in fairness he mostly builds rally engines on throttle bodies.
Its running on omex 600 and an aeg tru boost boost controller
Torque levels out at 241 about 5400 till redline
I can get a .52A/R turbine housing would that spool up quicker/earlier ???
Sorry dislexic me turbine housing is a TiAL 8652 so i presume thats a .86 A/R ?
Last edited by caprizetec170; 24-07-2016 at 06:39 PM.
Reason: wrong info
Just Looking for help from more knowledgeable people on here,
Just got my zetec turbo capri back from mapping,
And its shit it makes 315bhp but at 6900 and 14psi and's gutless low down
spec is st170 engine JE pistons arrow rods, 9;1 compression(suspect may be less) custom inlet (homemade)
homemade tubular exhaust manifold
Garrett GT2871R with a TiAL vband .63 housing
would fitting smaller turbine housing or shorter exhaust manifold shift spool and power lower down the Rev range,
Or any other suggestions would be great
Some detail might help.
When does it start to spool, what boost, any graphs or logs etc etc ? What are you using for boost control, how is this configured ? What is tuning like during spool etc ?
Surely the tuner had some input ?
Last edited by stevieturbo; 25-07-2016 at 11:33 AM.
When does it start to spool, what boost, any graphs or logs etc etc ? What are you using for boost control, how is this configured ? What is tuning like during spool etc ?
OK there some manifold pics, rough calculation inlet is about 3.6 litres, exhaust manifold is hard see but its basically just simple equal length 4 branch about 12 inches,
And boost controller is an AEM thru boost set at 16psi on a 38mm external gate which dosen't even make that much psi.
Also turbine housing is .86 not .63
OK there some manifold pics, rough calculation inlet is about 3.6 litres, exhaust manifold is hard see but its basically just simple equal length 4 branch about 12 inches,
And boost controller is an AEM thru boost set at 16psi on a 38mm external gate which dosen't even make that much psi.
Also turbine housing is .86 not .63
The tru boost is a very basic open loop controller...as such you dont set it at a particular boost. Just a fixed duty cycle after testing to achieve any desired boost level.
How much duty is it taking to make 16psi ?
What spring is fitted to the gate ?
Is the gate sealing correctly when closed ?
Exactly how is the gate plumbed ?
All of these things can affect spool ( as indeed can camshafts ! ) as well as tuning etc etc
The tru boost is a very basic open loop controller...as such you dont set it at a particular boost. Just a fixed duty cycle after testing to achieve any desired boost level.
How much duty is it taking to make 16psi ?
What spring is fitted to the gate ?
Is the gate sealing correctly when closed ?
Exactly how is the gate plumbed ?
All of these things can affect spool ( as indeed can camshafts ! ) as well as tuning etc etc
to be honset i just set up and plumbed it to instructions that came with it and fitted a 16psi spring, yes it seats correctly but the turbo has never seen more than 14psi
Really it needs someone experienced to look at it and make sure everything is ok.
Although I guess that was largely the point of taking it to a tuner ? So what did they say about it ?
And if the boost control is plumbed exactly as AEM list in their instructions, there should be no difficulty making 16psi or more with very low controller duty.
Unless there is a major cam/tuning/turbo/tuning issue somewhere
Unless there are huge leaks, the intake and exhaust manifold certainly wont be the problem.
The larger turbine housing would be worth changing to a smaller one though as it should be relatively cheap.
Really it needs someone experienced to look at it and make sure everything is ok.
Although I guess that was largely the point of taking it to a tuner ? So what did they say about it ?
And if the boost control is plumbed exactly as AEM list in their instructions, there should be no difficulty making 16psi or more with very low controller duty.
Unless there is a major cam/tuning/turbo/tuning issue somewhere
Unless there are huge leaks, the intake and exhaust manifold certainly wont be the problem.
The larger turbine housing would be worth changing to a smaller one though as it should be relatively cheap.
Well i can get a smaller turbine housing in either .52 or .62 not exactly cheap at close to £400 but if it solve problem not too bad
like i said above local rolling road guy that mapped it dosen't normally do turbo stuff and just reckoned turbo was too big,
thanks for help though
Well i can get a smaller turbine housing in either .52 or .62 not exactly cheap at close to £400 but if it solve problem not too bad
like i said above local rolling road guy that mapped it dosen't normally do turbo stuff and just reckoned turbo was too big,
thanks for help though
There a guy my mate uses called devil developments he seems real good with turbo zetecs and cossies etc. Not sure how far away from u he would be though
24-07-2016, 02:50 PM
Quicker Spool
it makes 315bhp but at 6900 and 14psi and's gutless low down
