20G setup tunning

[TurboTalon11]

I just recently installed my 20g on my car, but the car feels weird. With the stock turbo the car always felt like its ready to go. Now sometimes the car will pick up and go dispite the lag, other times it just feels like I'm not going anywhere. I have a twin turbo supra pump, 550CC injectors, aeromotive fuel regulator, vpc, gcc, external HKS wastegate, hallman boost controller. Is there anything I can improve with this setup or do I need to adjust somthing? Help me out guys, please. I'm stumped.

 

[awdrst]

do you have any sort of datalogger? There could be some knock in there causing timing to get pulled back.

 

[PaleDSM]

What is your method for tuning? Datalogs?

You can slap anything and everything to a car but that doesn't necessarily make it fast. You have to know how to tune the car and make everything work together.

 

[Mike 99GSX]

You need a datalogger. You need a FMIC. How much boost are you trying to run on pump gas? What octane gas are you using? You will max out your 550s pretty quick on any real boost with pump gas.

 

[Endz0r]

sounds like you are getting knock sometimes. i would get the FMIC and bigger injectors.

the same thing happens to me on my big16g. i'll punch it and it'll go, but other times i'll get some bad knock and it'll feel like a geo metro.

 

[Dieselboy]

You need a datalogger. You need a FMIC. How much boost are you trying to run on pump gas? What octane gas are you using? You will max out your 550s pretty quick on any real boost with pump gas.

Agreed. It kind of sounds like you just threw everything together onto the car without any real consideration of the tuning aspect. If you dont have a logger, you are pretty much driving blind. If the car pulls and then falls flat on its ass, then you are experiencing the ECU pulling timing because of knock (pre-dentonation). Also meantioned, if you are indeed on the stock IC, you will experience heatsoak with a 20G. You should run at least an upgraded SMIC like an MKIV Supra SMIC, Dejon Tool upgrade SMIC, etc... However, I would recommend an FMIC.

The 550cc's will do, but as Mike pointed out, you will max them out fast after you get yourself tuned for 20+ psi on pump gas. I would've gone with 660cc's for a 20G setup.

 

[TurboTalon11]

I have a datalogger but I had some problems with it and I put it down. But you guys are right I should of used it. Ok I'm going to get it back out. I'll rev the engine and see if I get any knock, but the only problem I have I got ABS and when I plug in the datalogger it makes the ABS light come on. What else should I look out for on the logger? To tell you the truth can someone teach me to tune the car with the datalogger? I feel stupid but I need the help.

I have a FMIC but I need to get pipes to install it first. I was going to get some 720CC injectors for the car cause I did have a feeling that the injectors might be maxing out. Right now the car is running 20 PSI on 93 octane. Thanks alot guys.

 

[Mike000]

The abs light is normal when you plug in the dataloger. Its send the abs into diagnostic mode which means no abs when its pluged in.

You might want to drop the boost a little till you work out the problems with knock.

Don't rev the engine and see if its knocking. Take if for a drive and lean into 3rd gear and see how much knock your making.

 

[TurboTalon11]

Can anyone help me out at all? I got my pocketlogger ready and working I just need some help tunning this thing. Please.

 

[Dieselboy]

Search around a little bit and do some reasearch instead of having people spoon feed you the info all the time.

http://www.digitaltuning.com/index.php?pid=dsm

That should get you started.

 

[Blue92]

I ran my 20G @ 20psi with RC550's without any knock problems for a long time at ~ 85% DC on pump gas. Don't worry about the injectors yet.

 

[TurboTalon11]

Yesturday I took the car out for a spin. I was watching to see how much knock I was getting. At 6500RPM I'm getting 43 knock counts. I was going to turn up the gain on the vpc and since I got a GCC I was going to turn up the OP out on the vpc. What you guys think think?

 

[Dieselboy]

I think you have some SERIOUS tuning issues. www.vfaq.com , http://www.plymouthlaser.com , get to reading.

 

[TurboTalon11]

No I don't have any issues, I'm just asking for a little help from someone to further understand things. Read the screen can't simplify anything. The reason for knock is because of alot more air than gas, no? That is the reason why I asked if I should turn up the gain. If I shouldn't just please tell me no. And correct me. Thats all I ask. Thank you for replying though.

 

[Mike000]

Turn the boost down to 11 psi. Nobody can fix your car if you don't have any idea on were to start.
http://www.vfaq.com/TMO/

When is the last time you have done a boost leak check?http://www.vfaq.com/mods/ICtester.html

Post a 3rd gear log, rpm, timing, knock, o2, fuel trims, airflow.
What are you afc settings at?

 

[TurboTalon11]

Turn the boost down to 11 psi. Nobody can fix your car if you don't have any idea on were to start.
http://www.vfaq.com/TMO/

When is the last time you have done a boost leak check?http://www.vfaq.com/mods/ICtester.html

Post a 3rd gear log, rpm, timing, knock, o2, fuel trims, airflow.
What are you afc settings at?

These are my results in 3rd gear runnnig 10 psi on pump gas. Right at 4000 I punched it up to 5000 but from 2531 to 4000 I was at a moderate speed just holding the gear.

RPM 2531 3031 3562 4000 4625 5000

KNOCK 0 0 0 0 6 4

TIMING 29 28 29 31 21 21

02 .55 .37 .61 .76 .88 .88

AIRFLOW 384 497 554 535 1203 1348

HI TRIM 81 81 81 81 81 81

MED TRIM 99 99 99 99 99 99

LOW TRIM 104 104 104 104 104 104

 

[AL92]

Well you can easily take it higher up for your logging at 10psi.Your numbers at 10psi look great.I think its hard to run much past 10 to 12 on big turbos without getting that intercooler on your car.Once you do that you should be able to run 15 to 20 and if not then try water /alco injection..I am sure your car is slow and knocking out the wazzo if you try to run 20.Sure guys run 20 psi on pump gas but they have big intercoolers.
I can't even at 15 I get pretty big problems and they heat soak fast on the stock intercoolers.
You have enough timing to try running a bit higher boost even right now I would think you could manage a few more pounds 12 or so.And a bit of knock retard is not that bad.Most cars have some knock count and don't blow up.And read timing above 15 is still considered acceptable.You can try richen it up a bit more and check o2 more at top of third at like 6500 to 7000 rpm.Of course we all know narrowband 02 sensors aren't great for tuning so tuning for timing and knock is usually better method.


My 50 trim does feel pretty lasy at 10psi .Sure it will feel way way better at 20psi.

 

[TurboTalon11]

Well you can easily take it higher up for your logging at 10psi.Your numbers at 10psi look great.I think its hard to run much past 10 to 12 on big turbos without getting that intercooler on your car.Once you do that you should be able to run 15 to 20 and if not then try water /alco injection..I am sure your car is slow and knocking out the wazzo if you try to run 20.Sure guys run 20 psi on pump gas but they have big intercoolers.
I can't even at 15 I get pretty big problems and they heat soak fast on the stock intercoolers.
You have enough timing to try running a bit higher boost even right now I would think you could manage a few more pounds 12 or so.And a bit of knock retard is not that bad.Most cars have some knock count and don't blow up.And read timing above 15 is still considered acceptable.You can try richen it up a bit more and check o2 more at top of third at like 6500 to 7000 rpm.Of course we all know narrowband 02 sensors aren't great for tuning so tuning for timing and knock is usually better method.


My 50 trim does feel pretty lasy at 10psi .Sure it will feel way way better at 20psi.

I'm going to start to get the pipes for the intercooler and put it on and I'll see what I can do according to my logging I get. Thanks alot.