small 16-g on auto?

[1bad4g]

ok ....i have a small 16g on an auto tsi....its bone stock except for a tial38 on the 02 housing and a nice header and full 3'inch exhaust.....it holds boost rocksoild @7psi from a dead stop to redline.
i guess what iam asking is whats the max boost i should run?...like i said its STOCK fuel injectors fpr. fuelpump....i know that the 13g is very small compaired to the 16....i plain on doing a 190fuel pump soon. but the car was put together with extra parts...i just don't know how much airflow is to much.... with such small injectors......i just don't want to (knock)...i know thats tough to know with out some management.....so i guess iam looking for some imput on experience...
thanks for your time.....

 

[habitatguy187]

For starters the wastegate actuator doesn't open until 9psi, so it sounds like you have some boost leaks. Take care of those first.

 

[rocafellafw]

For starters the wastegate actuator doesn't open until 9psi, so it sounds like you have some boost leaks. Take care of those first.

He did mention the tial wg, possibly could have a 7psi spring ? Anyway do a boost leak test nevertheless THEN you could safely turn the boost up to like 15psi. Consider some more gauges for monitoring.

 

[JusMX141]

Ran 15psi on a customer's stock '90 AWD with a Small 16G in a ported 6cm2 turbine housing a few years back. Spool was literally lightning-fast and the car felt strong.

Keep in mind that was with a manual; your auto having smaller injectors may not like 15psi too much.

 

[1bad4g]

For starters the wastegate actuator doesn't open until 9psi, so it sounds like you have some boost leaks. Take care of those first.

its a.04 kbar spring...5.80psi..so holding 7psi i think is pretty good....boost leaks.i checked twice @10psi.and did'nt have any.....the only thing i should change is the plugs..there not copper ngk's.
what iam wondering is the CFM differance between the to turbos...can i run 10-13psi with out knock...? this is an auto car..it only has 390cc injectors

He did mention the tial wg, possibly could have a 7psi spring ? Anyway do a boost leak test nevertheless THEN you could safely turn the boost up to like 15psi. Consider some more gauges for monitoring.

yea .04kbar....i do have a nice autometer boost and water gauge....i think i might have to brake down and get a wideband..to find the best boost pressure...

Ran 15psi on a customer's stock '90 AWD with a Small 16G in a ported 6cm2 turbine housing a few years back. Spool was literally lightning-fast and the car felt strong.

Keep in mind that was with a manual; your auto having smaller injectors may not like 15psi too much.

....so mebe 12-13? it has a 7cm housing and aMAP38 external gate setup on the 02housing and full3'in exhaust,i know its a lil overkill for a small turbo...but like i said.it was build with extra parts i had.

 

[juanpac0]

Ran 15psi on a customer's stock '90 AWD with a Small 16G in a ported 6cm2 turbine housing a few years back. Spool was literally lightning-fast and the car felt strong.

Keep in mind that was with a manual; your auto having smaller injectors may not like 15psi too much.

Autos have a higher base fuel pressure than manual 1gs tho. I think it was 43psi vs 37.5 so they should flow bout the same.

 

[JusMX141]

....so mebe 12-13?

I can't answer that for you, nor can anyone else on this site.

There are variables like fuel quality, air temp, compression ratio, intercooler efficiency, and many other things which the ECU calculates and determines what the max safe boost level would be. It responds by showing knock when the boost level becomes too high. The only way you'll know is to bump the boost level up a little at a time until you see knock, then back it off and be happy at that level until you buy fuel mods.

 

[1bad4g]

Autos have a higher base fuel pressure than manual 1gs tho. I think it was 43psi vs 37.5 so they should flow bout the same.

sweet...thats good news...i could run 14psi safe then...a fuelpump rewire or a 190lph pump to keep it safe.

I can't answer that for you, nor can anyone else on this site.

There are variables like fuel quality, air temp, compression ratio, intercooler efficiency, and many other things which the ECU calculates and determines what the max safe boost level would be. It responds by showing knock when the boost level becomes too high. The only way you'll know is to bump the boost level up a little at a time until you see knock, then back it off and be happy at that level until you buy fuel mods.

yea thats true...i run the shell v-power 93.and everything is stock...comp ratio,headgasket thickness innercooler
i don't have anything to see knock...think i should go till i hit fuelcut? then back off?.
also. can i remove the small honeycomb in the MAF? or is that only manuals?

 

[JusMX141]

think i should go till i hit fuelcut? then back off?

Fuel cut is the failsafe pre-programmed by the ECU to prevent damage. If you go far enough to hit fuel cut, you're DEFINITELY seeing knock.

Here's the deal- if you go to 15-16psi and see some knock but leave the boost at 15-16psi, what you would've gained by running the additional boost you'll lose in timing pull by the ECU. You've effectively done nothing but put a lot of unwanted stress on internals.