Vortec5300

Dynoed 403hp last month, went to HRP tonight here is the average results:

60'-2.04
330'-5.59
1/8-8.38
1/8mph-88.54
1/4-12.72
mph-113.93

This was on Nittos, granny shifting. This thing is half a second and 3-5mph off. WTF. Track and weather were perfect, even a slight tailwind.

Guess its back to G-force for a dyno check up.
Eventhough it was bogging out of the gate, it should have picked up more then 25mph on the back half shouldn't it? with 400rwhp? Raceweight was 3720lbs.

Vortec5300

It definetly needs gears to pick up the 330' and et but still, the mph is just not there. Many guys on this board are going much faster with the same parts.

Does 25mph on the back half seem slow?

glennster

iTrader: (1)

I run 12 teens at 115.My short times are
1.84
5.15
7.80/89-91mph
You need to get that thing going in the first 100 feet.You have the powa my freind!

LS1_PNYTAMR

iTrader: (1)

for the weight and the 60ft time, which both seem rather high in the numbers.... id say the car ran pretty good.... prolly going to need some gears, tires, dont granny shift, launch hard so it doesn't bog, cams dont make great power coming off the line at idle lol.... hell id say u ran a pretty good time all things considered.

i ran when i had lid/cutout and weigh reduction on 245 nittos with teh stock converter.... 8.1's with 1.90's 60ft's at 87-89mph and 12.70-12.80 at 107-108 is all

BlueSix

There's nothing wrong with your times. 25 mph on the back half is a helluva lot. I'd say there's another second and 5-7 mph in it with the right launch and some real shifting, but you're gonna need suspension and gears.

JRracing

iTrader: (35)

Don't feel bad, my first pass with new mods was 12.510@ 109.60 on a 1.93 60' 8.12@ 88.42 mph. I just istalled GMMG with a cut out in the pipe, going this wed night to see if I can better it.
Be paitient & work on it!

Vortec5300

ON one pass, I slid the clutch hard and the pedal hung up in half of its travel, it was really slipping good but the RPMs stayed up. The 60' was only a 2.13 but the 330' was a 5.54 as opposed to a 5.59 60 by keeping the RPMs up more, eventhough it 60'ed a tenth slower, it still 330'ed a .05 tenth better, thats making up a 1.5 tenth. Its definetly got too much bog. 2.0' 60s aren't THAT bad but its the 330' thats in the tank. Most other cam only M6s seem to be in the 92-94mph range, with 1.80-2.0 60s so it seems my 3-5mph off is all in the first 1/8. Nothing I can do about it really though until I can afford a 12bolt with 4.10s. The car was hooking fine with 3-3500 dumps. At 4k dumps it spins. The suspension is more of a road car type, no drag setup here. I was hoping for 12.20s@117 but...not that day. I guess 25mph on the back half is not that bad looking at some of the other cars on this board. I figured it would gain 27-30mph but I guess my math was off. Guess there is not much reason to take it back to the track until I get the 12B. I was gonna spray the 150 on it to help cure the bog but the main nitrous line had a leak so...

Coach 02 A3 Z/28

iTrader: (10)

3720 is very heavy. Your times are about right for the weight of the car. Pull some weight out and your times will improve. Suspension tuning will help the 60 foot out.

Coach

11SECSS

iTrader: (199)

Sounds like you need to check the tune ......did you change anything else you should be low 12's easy


my vert weights 3640 and only mod is basically a stall and I'm running 1.68 60ft and 4.95 330ft and 7.70 1/8@89 mph and trapping 111 ...

Vortec5300

Raceweight was including driver, slightly over half tank of gas and a full 10lb bottle. It seems my problem is definetly the first 1/8'. This thing should be going 90+ in the 1/8, probably more like 92mph, that would put me at 117mph so....Gotta figure out why the 1/8 is so far off. Even when other boardmembers are 60' ing 2.0s they are still going 5.0s-5.10s in the 330', thats the .5 seconds I am off. Its gotta be the gearing. After I would leave and it hooked, it didn't noticeably fall on its face but it did not pull hard once the clutch was out until 4k so... I never thought the 330' would affect the mph that much but if you look at 1/8 speeds, the answer is there. 88mph in the 1/8 is good for around 110-112 1/4 mph so...I am slightly faster then that so... I guess another trip to the dyno for a follow up pull is in order, then it seems that its gonna need 4.10s to ever pick it up. Lots of other folks out there running 12.20s@115+ with cam only and stock gears. Guess this is a case of "too big a cam" or something. No torque.

Any other suggestions?

black_ws6

I am in the same boat as you are. I switched from a TR220 Cam and Street tires to a TSP 231/237 cam and ET Street Radials. I launched at 4,000 and still only pulled a 2.006 60 foot. I went 12.73 which is .02 faster than last year, but I dropped 2 MPH. I thought these cams had a lot of top end?

Here is a thread in the PCM section with pictures of some diagnostics I pulled from HP Tuners today. Maybe someone can point me in the right direction to getting mine straightened out. https://ls1tech.com/forums/pcm-diagnostics-tuning/308306-help-bad-tune-something-else-pictures-included.html

Vortec5300

I am not sure about my tuning. G-Force tuned it but it was never scanned for KR. They just turned the knock sensors "down". I know my timing is a 24 degrees for the nitrous and the air fuel ratio is around 12.8-1 across the board on motor. Not sure what else they should have done in the tables. Mike did scan it for me at the track with a Tech 2 box and he said everything looked normal so... I am thinking the knock MAY have something to do with this. Jason at TSP said they are sensitive to knock and premature knock will pull timing and kill more power. Not sure but this bitch is parked until I figure out WTF is wrong with it. I'm going back to streetbikes, they always run right.

WickEdSix98

iTrader: (4)

Stop granny shifting and you'll pick up a lot of MPH and ET.

BlueSix

It's not your tune, it's your driving.

JL ws-6

iTrader: (50)

What s the total list of mods done to your car ( what cam, bolton's, suspension, etc ) because there's something that doesn't seem right. If it's not a tuning problem, then there is somethign else. I know that the granny shifting isn't helping any, but I do the same, and with nothing more thne headers, a lid and a smooth bellow on a predator tune on f1 tires I was trapping at 108, so that makes me think that you have another issue.

You got me worried that I'm not gonna have any better results then you are.. I did a cam in my car a month ago, and it made 403 to the tires, but thru a 12 bolt and steel driveshaft.. and my raceweight is about what yours is... I'm s heavy bastard (275) and my car's no lightweight.. but i was hoping to see better than 12.7x, I was hoping for 12.50 or better on E.T. streets.

RyanJ

Sounds like driving to me (no offense). Stop *****-footing around and start really shifting.

Besides the weak 60'...the 330-660' timeframe is really bad. I mean...my car (full weight 98 TA w/ a lid and a 3200 stall....stock tires) went 8.3...maybe 8.2 with a similar 60. That's sad. And 25mph is good from 1/8-1/4, but the overall trap is weak as hell. You are loosing a ton between 330-1000'. Shift harder, heat the tires more.

00RedWs6

If your going to race then why granny shift? Kind of a pointless thing to do. Wind that thing up to what its suppost to and start hittin some gears.

white_96_ss

yea what he said..

JL ws-6

iTrader: (50)

Well, before I bought my bogarts and e.t. streets, that was kind of pointless on goodyear f1's.. they just spun... and the first real pass on the e.t. street's I smoked the stock clutch... so that didn't go so well. A spec 4I, cam, frame connectors, lca's phb, tq arm, rel. brackets, spohn 1 inch solid sway bar, 12 bolt w/ 4.10's and a little weight out should ehlp out I figure.... I'm hoping to knock a good secind off the 13.50's @ 108 the car ran with nothing more than a lid headers and a catback.

I'm just a little concerned that my car will run like the car the thread starter's car does... as I made the same hp, and weigh close to the same.. as all the little things I did to drop the weight are back with the 12 bolt and frame connectors.. probably end up being a wash, and weigh rougfhly what his car does.

A 5000 rpm clutch dump should net some decent results with any luck.

black_ws6

The 12-bolt and 4.10's will help a lot. I am running 3.42 in a stock 10 bolt. I didn't launch above 4K because I was afraid to snap the rear end. I think with 4.10's, bigger injectors, and tweaking the tune, I can get it lower.