stock turbo & injectors fastest times?

[85 TR]

well i have gone time in sig with what i stated, is this pushing the inj and stock turbo, i want to run faster with car as is ? tune is only a guess with t- link so i just want somebody to tell me they have gone faster so i know i can.
my car still feels like it isnt running right even on the 13.7 run feels like its bogging while boost is coming up boost and during run ? are the inj and turbo what makes this car feel dead on the top end and sluggish during spool up < still runs ok times but not what i thought it was going to. thanks

 

[dragonational]

i have heard of people running 20 + pounds on stock turbos but i think thats pushing pretty hard. with a good tune and proper parts i think faster times with the stock inj. turbo combo is possible. Harry

 

[forcefed3.8's]

12.58@106. This is with all stock exhaust too. The trick is octane, boost, and timing.I ran this back in 1998. The injectors are the same as intercooled cars, so unless you are running low 12's, high 11's stockers are fine.

 

[cool 84]

I ran a 13.0@106mph with a stock turbo and injectors. Stock, clean injectors will take you farther than the stock turbo. On slicks I could've gone 12s with the stocker. In that form, I broke two stock turbos so I would say that's the max. Wastegate was locked shut and it would make 19psi at first and fall off at higher rpms and eventually break the shaft after a couple runs lol.

If you get your stock turbo to the 106mph range, when you bolt on a bigger turbo, the difference is amazing. I picked up 4mph with the TA49 with 7psi less boost. To go fast with the stocker I would recommend lots of octane and lots of timing.

For what it's worth, mine seemed to fall off at 17psi non intercooled but pulled to 20psi intercooled.

 

[forcefed3.8's]

I ran 20psi nonintercooled. While messing around with a bleeder valve, I had seen 30psi, but it was not making power.

 

[cool 84]

Originally posted by forcefed3.8's
I ran 20psi nonintercooled. While messing around with a bleeder valve, I had seen 30psi, but it was not making power.

That was probably the difference in airflow. Mine had ported heads, intake, a cam, and other mods to the motor at the time. Funny thing is no matter what I did, 106 was the absolute max I could get out of it. I think the turbo was very maxed out. My dad also ran 20psi on the stock turbo with a stock motor and it pulled fine. I think with the extra airflow of my motor the stock turbo just couldn't put out the extra boost efficiently.

 

[forcefed3.8's]

That just goes to show you that ported heads and a cam do nothing with a stock turbo. The only nice thing is you can make more power at less boost with lower octane. People argue with me all the time about ported heads, cams, larger engines, etc. It is all in the cfm rating of the turbo. Boost pressure will just vary.