First time at track with GN

[SS_Sean]

I took the GN to the track last night. Best run was a 14.95 @ 91mph with a 2.2 60' time. I was spooling up to 3-5 pounds on the line, and the car seemed to like 3 pounds. I was running 13 pounds at WOT. I need to turn the boost up to 17 and get some sticky tires!

Think it has a 13 in it with tires and more boost?

edit-oh, that was at 1410 feet elevation with a really good DA of 2800 feet.

 

[TurboDave]

Take another pound or two of boost out of it, and my 84 Z28 might give you a run. :wink: :wink:

 

[SS_Sean]

Thanks for the suggestions.

 

[Pronto]

13 lbs on a 49 is no better than the stock turbo. Try it starting at 20lbs and working your way up from there. You have the supporting parts, go for it alittle at a time.

 

[SS_Sean]

Hey, thanks for the advice. It was my understanding from Mike at Full Throttle that 17 pounds was the most I should run on 92 octane with the chip he cut for me. Why do you suggest 20 pounds? Not calling you wrong, just dont want detonation.

Anyone venture to guess how many turns in I should make on the wastegate rod to get it to 17 from 13? Or 20 to 13 for that matter?

 

[Terry_H]

I rely heavily on my visual knock guage. If it stays all green then I need more boost. When you get to about 5 degrees knock retard, then you are close. With 92 octane, I would start at about 17 and hopefully get a few more if your car is in good tune and the combustion chambers aren't full of deposits.

I think 13's are just a boost adjustment away. Your 60 ft is pretty typical for stock wheels/suspension. Even with a 2+ 60ft, I've run high 12's with a setup way more stock than yours. Race gas and high boost with knock off yet another second.

 

[QUIP'6']

Hey, thanks for the advice. It was my understanding from Mike at Full Throttle that 17 pounds was the most I should run on 92 octane with the chip he cut for me. Why do you suggest 20 pounds? Not calling you wrong, just dont want detonation.

Anyone venture to guess how many turns in I should make on the wastegate rod to get it to 17 from 13? Or 20 to 13 for that matter?

just get an alky kit and forget about it. I got 93 octane and 27 pounds of boost 24/21 on the timing SCARY FAST

 

[Adam Connell]

I dont know if it's BS or not but I read somewhere that each lb of boost is worth roughly 8hp... so your looking at roughly 30+hp... 13 is WAY too low though man...

 

[SS_Sean]

Yes, it is!!

 

[Pronto]

Throw some 100 octain in and start raising the boost. I would definately get the AlkyControl kit (I love it) so you can permantly raise the boost. You'll be greatly impressed with the higher boost level power.

 

[TurboMonte 2]

On 92 octane you better NOT try more than 16-17# boost--or you risk trying next for HG replacements=no fun! WG rod adjustment is typically one (1) turn for one (1) # boost. Shorten rod to "shorten engine life" (increase boost)...

 

[8AV8]

Do you have a good boost gauge or are you talking about the stocker?

 

[SS_Sean]

I have a autometer boost gauge installed. My stock tach and boost gauge are way off.

 

[UNGN]

A TA-49 will be slower than the stock turbo at stock boost levels. I would suggest your next mod be to increase the octane you run with either race gas or alcohol injection and turn the boost above 18 psi.

 

[SS_Sean]

Slower? I thought the thing about larger turbo's is the ability to push more air. That seems a little odd to me.

 

[Pronto]

They do push more air but each has it's own map. Turbo Selection: A Guide to Understanding Flow Maps - Automotive Articles .com Magazine The map will determine where the sweet spot (best efficientcy) is and when it's all done. Lots of turbos overlap but then deviate as the rpm and boost go up. One might work great at 18 psi while another will work ok but not hit it's best until 26. Your cam has raised the rpm that your engine will make it's most power so you need to match that too.

 

[UNGN]

Slower? I thought the thing about larger turbo's is the ability to push more air. That seems a little odd to me.

The Cross-over point for a TA49 vs. a stock turbo on a stock motor car is around 18-19 psi.

Below this, the stock turbo makes boost more efficiently, spools faster and will be quicker in the 1/4 mile.

Above this, the TA-49 will be faster.

I, like you, bolted on a TA49 thinking I would be faster across the board.

I had extensive data on what the stock turbo would do for a given boost level, and did the same with the TA49 and the results surprised me at the time.

Basically, with a stock, unopened motor, the Stock turbo was faster until "race gas required" boost levels were achieved.

 

[SS_Sean]

VERY good information, guys. It makes sense, and I appreciate it. It's time for alky and 20 pounds of boost, I believe. This car isn't a daily driver, so I'm not too concerned about that. I do occasionaly drive it on long trips, 250 miles one way. How do you deal with alky injection on a long trip like that?

 

[bsdlinux]

VERY good information, guys. It makes sense, and I appreciate it. It's time for alky and 20 pounds of boost, I believe. This car isn't a daily driver, so I'm not too concerned about that. I do occasionaly drive it on long trips, 250 miles one way. How do you deal with alky injection on a long trip like that?

Well I'm assuming your cruising on a trip like that, if not fill the alky bottle and have fun
:biggrin:

 

[SS_Sean]

Just adjusted the rod four complete turns. I took her out and got fifteen pounds of boost. My 02mv were 804 on one pass, and 820 on another. The retard was 0.7. I'll give her another four and see if it sits on on 17.