Boost and timing limit with 104 unleaded?

[2QUIK6]

Just curious as to what the max boost and timing others have ran with 104 unleaded fuel and turbo size before getting Knock?

I seem to only be able to run about 21# and 25 degrees of timing before getting 2-3 degrees of KR with a GT35 turbo.

[Nojug]

I dont think I would run anymore than 20# and 22 degrees of timing. I cant run anymore than 25# and 23 degrees of timing on 110 Cam2. Keep in mind 104 unleaded is only 98 motor octane and 110 Cam2 is only 105. VP C16 is 117 motor octane that is what you want to run if you want to run higher boost and timing.

[Nojug]

BTW turbo size does not matter when comparing how much boost and timing you can run with a certain octane it is compression ratio and heat (Charge Air Temp).

[krom]

I ran 23lbs of boost 23 degrees timing with 0 knock in 5 runs in Vegas last weekend. I put on a thunderfab stock intercooler and that has made all the difference.

TA 49

[2QUIK6]

Originally posted by Nojug
BTW turbo size does not matter when comparing how much boost and timing you can run with a certain octane it is compression ratio and heat (Charge Air Temp).

That's exactly why I thought turbo size would matter since 20# on the stocker would be alot hotter charge air temp than a much larger turbo??

[forcefed3.8's]

Turbo size does matter. I was able to run 20lbs on 94 octane with a PTE51 with no detonation, but with the stocker, I was only able to run 16 to 17.

[TurboCustomz]

Originally posted by 2QUIK6
That's exactly why I thought turbo size would matter since 20# on the stocker would be alot hotter charge air temp than a much larger turbo??

Your exactly right. The efficiency of a turbo makes all the difference. The stock turbo running 20psi is going to give you a much hotter intake charge the a larger, more efficient turbo at the same boost. There are of course other things to take into account. Alky injection, intercooler upgrades, ect. Plus, 94 octane from Sunoco is not the same as 94 octane from a place like speedway. I know here in Louisville, we dont have good quality gas.
Each indiviual car has it's own characteristics. All of these things could mean the difference in 2lbs or a degree or two of timing on different cars. An engine with 150,000 miles is most likely not going to react the same as an engine with 50,000 miles. Compression is most likely going to be different between the two.

[Bobs rare 6]

I have run 24# boost with 104 and turbo tweaks 100 chip. I have a power plate. Maybe that helps. Bob.

[bruce]

Originally posted by 2QUIK6
Just curious as to what the max boost and timing others have ran with 104 unleaded fuel and turbo size before getting Knock?

I seem to only be able to run about 21# and 25 degrees of timing before getting 2-3 degrees of KR with a GT35 turbo.

A 307 pump is really pushing it.

With my 60 PPH injectors I'm running a double pumper, but I really like to error on the side of caution, when it comes to fuel.

Try more boost and less timing, IMO.

I've run 26 PSI at 18d on 94 octane. But, the tune has alot of time in it.

[XLR8]

23* timing and 23# of boost on 100UL all the time with my TE-44.

[bogie1]

I am tunning my new combo now and have not hooked up my Razor Alky on my new PTE front mount intercooler yet.
Here is what I have been able to run so far with 93 Amoco and 0* KR.

23*/21* extender chip
4*/ 0* added to 1st and 2nd gear - 0 added to third--with chip
8*/ 8* added to base timming.-- with translater plus


35* total advance in 1st and 2nd up to 3200rpm's /29* advance in high gear up to 3200 RPM.

I take out 6* timming after 3200rpm to both high and low gears which gives me 29* after 3200 in 1st and 2nd and 23* in high gear with the translater plus.

The bottom line is:
up to 3200 rpm
35*/29*
after 3200 RPM
29*/23*

I am also adding in 14% rich fuel at WOT with Translater plus

I am setting my Spool up fuel 8% lean with the extender chip

I run 20 # of Boost with 0* knock with 93 octane Amoco with this set up with 0* KR.
The car fells very strong with this set up --now the fine tunning begins. (this is my street set up)
------------------------------------------------------------------------

With 5 gals Xylene in a full tank I ran 24# Boost and the following timming. With 0* KR

31*/ 25* up to 3200RPM

25*/19* after 3200RPM

I Am running a PTE FM I/C, TA49 and Power plate, MSD 50lb, 40 lbs fuel pressue with vac line on.

After I hook my Alky kit up I am going to lower the timming and try for 26-28lbs boost. I hope to have some times from the track this Sunday.

Before I added the Power plate, Front mount I/C and TA-49 I was lucky to get 15-16# boost before KR. Really amazing.