got boost?
#1
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Thread Starter
got boost?
Has anyone been able to consistently boost 12-16 psi on a stock Turbo II turbocharger?
Okay is the deal, I have a monster street ported 91 Turbo II motor with a full 3 inch straight pipe exhaust system, HKS blow off value , HKS AIC, and HKS early 90's boost controller.
At full throttle, set at maximum boost the car will boost up to 10-11 psi in first and second gear. But when I get up to fifth gear boost climbs to 15 psi. What’s really weird is that when I roll into the throttle say in first or second gear boost will jump up to 15 psi but then drop down to about 10 psi at full throttle.
Can anyone please give me any suggestions on why my car does not consistently hold boost.
Okay is the deal, I have a monster street ported 91 Turbo II motor with a full 3 inch straight pipe exhaust system, HKS blow off value , HKS AIC, and HKS early 90's boost controller.
At full throttle, set at maximum boost the car will boost up to 10-11 psi in first and second gear. But when I get up to fifth gear boost climbs to 15 psi. What’s really weird is that when I roll into the throttle say in first or second gear boost will jump up to 15 psi but then drop down to about 10 psi at full throttle.
Can anyone please give me any suggestions on why my car does not consistently hold boost.
#2
Keep Right Except to Pass
In general you'll get more boost with more load. 11 pounds in first seems much more than normal and I would attribute this to the porting.
I would think you'd be able to hold max boost from 2nd or at least 3rd on up.
Maybe you are just over-ported for the stock turbo? The engine is pumping more air than the turbo is capable of handling efficiently? Or turbo and wastegate in combination anyway?
I dunno, just throwing that out there.
I would think you'd be able to hold max boost from 2nd or at least 3rd on up.
Maybe you are just over-ported for the stock turbo? The engine is pumping more air than the turbo is capable of handling efficiently? Or turbo and wastegate in combination anyway?
I dunno, just throwing that out there.
#4
Full Member
Thread Starter
I forgot to metion the I had the exhaust sleeves removed.
No I haven't had the wastegate ported.
Would porting the wastegate help me boost consistently?
No I haven't had the wastegate ported.
Would porting the wastegate help me boost consistently?
#5
spending too much money..
iTrader: (2)
YES! Get that thing ported and you shouldn't have any more problems like that.
here check this out.
https://www.rx7club.com/2nd-gen-archive-72/serious-s4-wastegate-porting%85-352816/
here check this out.
https://www.rx7club.com/2nd-gen-archive-72/serious-s4-wastegate-porting%85-352816/
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#8
Originally Posted by Chon
Will porting the wastegate help keep the boost up at around 15psi?
#9
Originally Posted by Chon
Have any of you guys boosted say 14-16 psi consistently on a stock turbo?
#11
Originally Posted by Chon
Well if the stock turbo is simply maxed out, do any of you guys have turbo upgrade recommendations?
~$750, alot of members running this turbo. Straight bolt on. Tried and true. Good bang for buck
If you want more power look at a custom set up or the Greddy upgrade kit for around $3k.
#13
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#17
What sort of Fuel mods do you need to support 15+ psi?
I had a PGT running 27 psi on a .60/.63 T3 with SDS standalone, but SDS don't support rotarys so i am going to try to make some decent HP on the stock ecu and injectors...Nothing crazy but 15 psi maybe max....
I also have a walbro 255lph....
I had a PGT running 27 psi on a .60/.63 T3 with SDS standalone, but SDS don't support rotarys so i am going to try to make some decent HP on the stock ecu and injectors...Nothing crazy but 15 psi maybe max....
I also have a walbro 255lph....
#20
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Join Date: Jul 2004
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Originally Posted by AdAm87TuRbO2
At first I was like "why the hell pay that, just buy a T61 garrett or something for less" but then I remembered that you'll need a manifold and wastegate with that as well, jacking the price up to above a grand.
I wonder if they also do a rebuild for the core while they're at it? do you guys know if they charge less if your wastegate is already ported?
Overall its a great deal!
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