Owners with GT6152's combo's and times please.

[TrooperT]

Thinking of purchaseing one of these turbo's. My setup is almost identical to F-1's. Please post any updated track times or dyno pulls along with info on boost #'s/ chip timing and type of fuel used to get your results. Any and all info is greatly appreciated. TIA Phil.

[murphster]

Finallly made it to the track with the GT6152 today. Went to Englishtown's test and tune session. Temps were in the low 40's, sunny day, and not many people at the track.

My best run of the day:

60' 1.54
1/8 7.24@92.5
1/4 11.51@112.2

All my other runs were 11.5s and 11.6s at around 112. Not a single bad run the whole day!

I'm running a 23/21 timing TurboTweak chip. To be safe, I just left the timing at base values. I did have to add more fuel in through the chip because it did seem to be running on the lean side. I ran 27lbs of boost for most of the runs. On one run I ran 25lbs of boost and it ran 0.1 and 1 mph slower in both the 1/8 and 1/4. I ran 28" MT DR's (275/60/15s) to try and keep the rpms down. I'm running a 3200 9" Art Carr converter (not locking it) that seems like it has a lot of slip on the top end. I was turning 5400 rpm through the traps. With this converter it seems like I only pick up 20mph from the 1/8 to the 1/4. I tried a tighter converter previously and the car picked up almost 24mph with the converter locked, but overall it was slower because the 1/8 ET and mph were down.

I kept the tires at 20psi and launched at 10lbs of boost on the 1.54 60'. The first run I launched at 5lbs of boost and kept launching harder each run. My 60 foots, in order, were 1.64, 1.61, 1.58, 1.56, and 1.54. I am also using an RJC boost controller. I also leaned out the first gear fuel in my TurboTweak chip, which seemed to help. I had 6psi in the air bags to help prevent the tires rubbing on the launch. With more tweaking and launching even harder, I think 1.4s could be in the future.

Here's the rest of my combo:

50# MSD injectors
stock IC with dutt neck
stock cam
stock heads
stock throttle body/plenum
stock MAF
HR bar
no front sway bar
stock boxed lower controls arms, stock uppers, both with poly bushings
Lakewood drag shocks 50/50 rear, 70/30 front
big mouth cold air intake
power plate
THDP
ATR dual 3" exhaust
no cat
Dynotech Hi-Pro trans
Walbro 340
Alkycontrol progressive alky kit, using methanol with 93 octane
data logging with Directscan, EGT
using S10 wheel cylinders to hold boost, line loc during burnout

Very happy with my runs today. It seems like the turbo did make a little more power running 27lbs boost compared to 25lbs boost. Hard to say how much more power though. With the stock cam I was already out of my power range at the rpms I was seeing. With another cam I might have picked up more. Plus I'm still using stock IC, throttle body, and heads. Might be flowing too much for my combo, hard to say.

Another thing I noticed is that I'm almost out of injector, even with the alky. After I added fuel through the chip, I was at 93% injector on the last run. Might have to bump up fuel pressure or add more alky if I run much faster.

The last thing is that I was still at a pretty safe timing of 23/21. I can probably run 26-27 timing in 1st/2nd gear, but not sure how much, if any, I should raise 3rd gear. I might try lowering the boost down to 25lbs and then add the timing, to give a little safety margin. My guess is that the timing will help more than the last couple lbs of boost with my stock IC/head combo.

Hopefully some others will have more feedback on this turbo. It worked good for me today!

[Blazer406]

Awesome runs for first time out this year..... I expect there is alot of power to be had with the timing bumped up.... What is your race weight? Do you have the front swaybar installed? How much difference in your opinion was the addition of the drag shocks over the stockers? is it a trade-off if they are for a daily driver? Your combo is nearly the same as mine except I am still running the stock turbo...... I am eventually going to put my big mouth cold air kit back on with the LS1 MAF meter....I hope to possibly go back to the track on the 18th..... will have some more stuff done... looking for some 1.5's on the 60'.... and some more MPH....

[murphster]

My car drives pretty good with my current shocks. I don't have a front sway bar, and with these shocks the front of the car tends to rise pretty easily on the street. I think it looks pretty cool. A less friendly daily shock would be a 90/10 front shock. This will make the front end even looser compared to the street/strip 70/30 front shock I have. The 90/10 will rise faster and lower slower, best for the drag strip. The 50/50 rear shock is more of a pretty standard shock. With the HR bar, the car handles very good, even without the front sway bar. Still tends to drift a little and can be a pain on a windy day though.

[SloGN]

hey guys i went out to Kinston dragway to meet up with some of the local buicks guys.

i drove the car down there 160 miles. i made to runs on street tires. the temp was in the low 50's with a slight breeze blowing.

first run was as follows 1.923 60 FT 7.80 1/8 @ 93.28 MPH @ 20psi that was in the left lane.


the second run was made in the right lane and the car broke the tires loose in the bottom of second. 1.921 60FT 9.28 1/8 @85.02 mph.

after that second run i decided not to play anymore since i was not hooking very good so i wanted to keep all my body panels nice a straight and not bump the wall


i can't wait till i get my 1.65 roller rockers on and then bolt some slicks on the car

still not too bad for driving to the track and and still putting up some high 7 second pass and a low 90's MPH first time out for the year

[Slo86GN]

Dang Slo......you have me itching to get Ol Gray back together and broken in, and hit the track. Those are some very good times for hard tires....the mph is killer for 20 psi and a stock cam. I'm curious how OG is gonna run since I have a few more mods (roller cam, 1.6 rockers, S-cover 6152, PTE fmic). Dang this is going to be a fun year.....

[murphster]

Ran the 6152 again this evening at E-town.

1st run:
60' 1.59
330 4.65
1/8 7.28
1/8 92.9
1000 9.57
1/4 11.53
1/4 114.5

2nd run:
60' 1.55
330 4.60
1/8 7.23
1/8 92.8
1000 9.52
1/4 11.48
1/4 112.4

3rd run:
60' 1.57
330 4.64
1/8 7.28
1/8 92.4
1000 9.59
1/4 11.55
1/4 114.2

Temps were in the high 30's, a bit chilly. All runs at 27lbs boost. First run was 26/23 timing, 2nd run 26/24 timing, and 3rd run 23/21 timing. Seems like the higher timing in 3rd didn't help.

I'm finally illegal! I was warned by two tech people that I need to get a cage!

[8tsixt]

looks good murphster. what injectors are you running?

[J Speak]

He running 50 pounders, Looks my oo9 with alky will definately not be enough. Thinking of going with 60lb's from fullthrottle. Great runs. I am hoping to get in the low 11 with same setup except for the powerstroke intercooler. Did you feel the 28" were to tall. Thanks for the info Justin

[murphster]

Yes, I'm running 50# MSDs. On those runs I was at around 80% injector with the alky (actually methanol). If you plan on running anything bigger than a 44/49 might as well go with the biggest injectors you can for the stock ECM. I think the chipmakers have a good handle on them and I don't remember seeing any complaints about driveablility.

I think with a better flowing intercooler, it will help reduce the pressure loss from the turbo to the intake. To be producing 27lbs boost, I might be making 30lbs at the turbo and losing 3 or more across the stock IC. As some people have mentioned in other threads, this might be out of the turbos efficiency range. Will be interesting to see how much a front mount will help me. I'll probably need a cage first though....

The 28" tires help out in two ways. First, it definitely seems to grip better. If I was on 26" tires I'd be spinning them more often in the cold weather. Secondly, it helps lower the rpm on the top end. Too much rpm will be out of the power range of the stock cam. Also helps to keep the rpm down it you want the engine to last longer. This will also depend on how efficient your converter is and whether you lock it or not. My converter is not very efficient. 26" tires are not an option unless I want to put it in overdrive (I don't).

My rpms are still too high and my mph is a tad low for my ETs. With a multidisc lockup converter I could probably shave a .1 or more off my ET. With a better 60' when it warms up I could be looking at 11.2s or so on a new converter. Not bad for a stock setup.

[8tsixt]

sorry to keep bugging you about your combo Murphster. i am asking all these questions because i am building a 4.1 motor. i will be using hyper pistons, ported stock heads, aftermarket cam, stock headers,stock i/c with big neck, gt6152s turbo i purchased from a board member, alky, & ?? injectors. i have a 3000l/u converter for this combo. lmk if this combo sounds like it all matches up together. it's still in the works due to $$. thanks for any info. Carlos R.

[jetmech]

murphster: what rpms are highest for stock cam.

[SloGN]

FRom the dyno sheet i have from my car witht he mods below and a stock cam. The power starts to fall off about 54-5500. But i think some 1.65 rockers will help the stock cam out.

[murphster]

Originally Posted by 8tsixt

sorry to keep bugging you about your combo Murphster. i am asking all these questions because i am building a 4.1 motor. i will be using hyper pistons, ported stock heads, aftermarket cam, stock headers,stock i/c with big neck, gt6152s turbo i purchased from a board member, alky, & ?? injectors. i have a 3000l/u converter for this combo. lmk if this combo sounds like it all matches up together. it's still in the works due to $$. thanks for any info. Carlos R.

I can't say much about the pistons/cam because mine are still stock. With the ported heads, you might want a better flowing intercooler such as a huge stock location or a front mount. As for injectors, I'd get the 60lb injectors for the stock ECM. With the alky, should get you well into 10's. For a GT6152 "S" turbo, the 3000 converter may not be enough. May want something in the 3300-3400 range. You could probably use the 3000 converter, just won't spool as fast.

As far as the stock cam, I think most people say the power starts to level off in the low 5000 rpms.

[jetmech]

Murphster: we have similar combos , i just ordered the 60#'s and extreme chip for the trans plus and 28x9 slicks wiil be used this year. we'll see what a 128k mile motor can do. thanks for the reply

[DonnieShort]

Originally Posted by jetmech

Murphster: we have similar combos , i just ordered the 60#'s and extreme chip for the trans plus and 28x9 slicks wiil be used this year. we'll see what a 128k mile motor can do. thanks for the reply

The Extreme Extender is for low z injectors. 60's are high z's. Might want to check on that so you don't have any possible trouble.

[jetmech]

mike told me he can do the extreme in the 60's. I thought the same thing but thats what he told me when i called him.

[Blazer406]

This is getting off topic.... but the extreme chip measures up to 768 gm/sec airflow..... where the regular extender measures 512 gm/sec. I don't know about you... but 512 gm/sec seems a plenty unless you are running a lot bigger inch stage II setup on lots of boost....... just my opinion...... but there isn't a big deal for 99% of the perople running a translator if they can't measure over 512 gm/sec for airflow. I am unaware if there are any other differences.

[Slo86GN]

I would have to use the Extreme for my combo due to the 60/65# Motrons,