Having boost issues please advise
Thread Starter
Staging Lane
Joined: May 2013
Posts: 97
Likes: 5
From: Blackwood NJ
Having boost issues please advise See build details in my sig. Turbo kit is a KB log style crossover is behind the engine. Waste gate is a Tial 44. Tapped in right below the T6 turbo flange. It is vented to atmosphere. I have only one spring installed for min. Boost. I've. Only made a few hits at the track to get some data logs. It's very rich at the moment say 10.3 :1 boost is very slow. Starting on the 2 step. 4000 rpm. It leaves on one psi. At the top of 1st gear. 6000 rpm she has 3 psi. 2nd gear 6000 rpm 5 psi then 3rd it will ramp up to 9 at 6200 rpm. I'm running no boost controller. Just a line from the turbo outlet o bottom port on the wastegate. I don't understand why it will not reach 9 psi in 1st or 2nd. The boost curve in the data log looks like a slow clime from 0 to 9. In a almost strait line. RPM seems to have no effect. I've never seen that in any of my turbo cars before.
I pulled the wastegate today and checked it its is moving freely. I actuated it with compressed air.
I also checked for boost leaks. I didn't find any.
any
I'm looking for some Advise on what to check next.
Turns out my converter was shot. I had it rebuilt . It was a used single disk PTC billet . totaly slipping over 5000 rpm thus not properly loading the engine. I had Pats transmissions in Folsom PA rebuild It and Tighten it up. now the boost is rock solid. Cost me 375. There good guys over there if any one local needs a converter built.
I pulled the wastegate today and checked it its is moving freely. I actuated it with compressed air.
I also checked for boost leaks. I didn't find any.
any
I'm looking for some Advise on what to check next.
Turns out my converter was shot. I had it rebuilt . It was a used single disk PTC billet . totaly slipping over 5000 rpm thus not properly loading the engine. I had Pats transmissions in Folsom PA rebuild It and Tighten it up. now the boost is rock solid. Cost me 375. There good guys over there if any one local needs a converter built.
Last edited by autoaddictions; May 27, 2016 at 06:49 PM. Reason: Update
TECH Enthusiast
Joined: Mar 2013
Posts: 503
Likes: 38
If he can't build boost because of tire spin not giving him enough "load" it is not because he does not have enough "load" it is because his throttle is not all the way open or he would just blow the tires off.
Thread Starter
Staging Lane
Joined: May 2013
Posts: 97
Likes: 5
From: Blackwood NJ
Last edited by autoaddictions; May 1, 2016 at 03:59 PM.
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On The Tree
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https://youtu.be/p4FEHk230r8Tires not spinning this was the reason for testing at the track. Not even a squeak when I launched at 4000 rpm. I have it on video.
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Staging Lane
Joined: May 2013
Posts: 97
Likes: 5
From: Blackwood NJ
See build details in my sig. Turbo kit is a KB log style crossover is behind the engine. Waste gate is a Tial 44. Tapped in right below the T6 turbo flange. It is vented to atmosphere. I have only one spring installed for min. Boost. I've. Only made a few hits at the track to get some data logs. It's very rich at the moment say 10.3 :1 boost is very slow. Starting on the 2 step. 4000 rpm. It leaves on one psi. At the top of 1st gear. 6000 rpm she has 3 psi. 2nd gear 6000 rpm 5 psi then 3rd it will ramp up to 9 at 6200 rpm. I'm running no boost controller. Just a line from the turbo outlet o bottom port on the wastegate. I don't understand why it will not reach 9 psi in 1st or 2nd. The boost curve in the data log looks like a slow clime from 0 to 9. In a almost strait line. RPM seems to have no effect. I've never seen that in any of my turbo cars before.
I pulled the wastegate today and checked it its is moving freely. I actuated it with compressed air.
I also checked for boost leaks. I didn't find any.
any
I'm looking for some Advise on what to check next.
I pulled the wastegate today and checked it its is moving freely. I actuated it with compressed air.
I also checked for boost leaks. I didn't find any.
any
I'm looking for some Advise on what to check next.
What kind of timing do you have during the launch and throughout the run? 10.3 is definitely too rich and a problem that should be addressed. Are all of the cylinders firing? Check the temperatures on each exhaust port to see with an infrared thermometer.
Thread Starter
Staging Lane
Joined: May 2013
Posts: 97
Likes: 5
From: Blackwood NJ
I will try the stiffer springs and see what happens.
Thread Starter
Staging Lane
Joined: May 2013
Posts: 97
Likes: 5
From: Blackwood NJ
Timing is around 20* and it slowly runs down to 9 at 20 psi. Again just using an initial safe timing map until I get the fuel map close to my target 11.5.
I removed 3 springs and installed just one. The litest one I had. I did this because the boost was 16-17 psi. I couldn't do any street tuning because the tires would just spin. I put the smallest spring in to limit the boost down so I could do wot pulls on the street to get the afr close and shift points set correctly.
I will try the stiffer springs and see what happens.
I will try the stiffer springs and see what happens.
The boost ur making and the back pressure with the light spring is pushing the gate open.
Basically, you need to run a boost controller to limit/control max boost.
Get one and add a 4 port solenoid so you can have very low boost (like 5psi/light spring) all the way to whatever you want.
I had the same problem, couldn't make near wg spring pressure til i added a 4port solenoid.
Last edited by LT1PWRD; May 2, 2016 at 11:06 AM.
I think you are fine.
Just work on your fueling and timing with what you have.
Too fat will hurt boost just because it's not happy yet.
Lower boost in low and second is typical.
Most of us run NA timing to 4 psi or so, then ramp it down as boost increases.
You can also run NA fueling in that range too.
Just keep tuning it. Your approach is sound. I did it the same way. Took it to the track when I realized I was going to get arrested doing boost tuning on the freeway.
My first hits were in the 11's. Being patient and learning how to tune it, I'm now bottom nines. Foot brake, no boost controller.
Ron
Just work on your fueling and timing with what you have.
Too fat will hurt boost just because it's not happy yet.
Lower boost in low and second is typical.
Most of us run NA timing to 4 psi or so, then ramp it down as boost increases.
You can also run NA fueling in that range too.
Just keep tuning it. Your approach is sound. I did it the same way. Took it to the track when I realized I was going to get arrested doing boost tuning on the freeway.
My first hits were in the 11's. Being patient and learning how to tune it, I'm now bottom nines. Foot brake, no boost controller.
Ron