RJBAILEY84

iTrader: (4)

So I got my dyno tune today and the results were not what I expected.. How do you guys feel about this? 380 rwhp - 351 tq

My initial goal was to try to hit the bottom 11's on motor, possibly 10.99. However after today I'm feeling a little disappointed in my setup. Had a bunch of people estimating my setup around 420-460 which would have been great by me after seeing numerous cars running that HP and hitting 10's. Is something in this setup no matching or what? What do you guys think is going on or do you think my problem is, if any? Thanks in advance gents.

By the way tune and motor seem to be great so no fault on the tuner or builder in my opinion.. I had some great guys to deal with on that note..

388 LTX Block
Callies billet splayed 4bolt caps
4340 Eagle 3.75 crank
6" Eagle Forged H beams
Mahle Piston
Canton 7qt pan
Custom Cam HR- (242 246 on a 110 lsa .593 .577 lift)
CR- 11.6 / 1
AFR 210 Heads (slight port and valve job done local to NC)
CSR EWP
LT4 Air gap Intake
58mm BBk Tb
MSD 6AL
Built TH350
TCI 3600 nitrous stall
BMR cross member
UMI Torque Arm
PHB
LCA
SFC

97Z28SS

iTrader: (5)

I think most of your loss is in the converter because with a turbo 350 trans the converter is probably a non-lockup type. Do you know the slippage percentage of the converter and what gears are in your car, also what rear is in the car 9", S60, 12 bolt or stock? Also what size injectors and what fuelpump do you have?

96capricemgr

iTrader: (1)

I would say run it before being too disappointed but at the same time those making the much higher estimates for you were basing those estimates on marketing and benchracing and not on some actual documented result.

I hope the edecrap intake is heavily worked? If not that should be on your short list of culprits, not 40+hp but on a stock engine the edelbrock stuff is not shown to be an improvement and some tests look like it might hurt power.

BizZzatch350

iTrader: (33)

There is no problem far as I see, you have a TH350 not a T56 where most your number estimates sound like they came from. Take it to the track.

96lt1m6

iTrader: (31)

Dyno numbers and most expectations are a huge ************ of emotions.. hit up the track and see what's really going on.

RJBAILEY84

iTrader: (4)

So to answer a few questions for you... I'm running a sock rear with 3.73 gears and a 275/60-15 MT street tire. Running a Walbro 255 pump with 42 lbs injectors. All the fuel seems good. Psi checks out all the way through the pulls to 6300.

Now since everyone said it and the hard on I had to day.. I went to a local 1/8 mile track.. here's the numbers :-)

8.28 @ 86 mom
2.05 sixty foot

The car felt strong coming out the whole with a little spin, but when shifted to second it falls on its face and feels sluggish as hell. I shifted at 6100 and it would drop second gear to 4000 rpms and slowly pull back up..

This was the first time out on a new motor with a little less than 200 miles on it. However comparing to my came only setup before its only 4mph quicker and 3 tenths of a second faster. Cam only setup also made 318 / 322 with the same rear end, cam only, bolt ons, through a 4l60e and a 2800 converter.

So now what do you guys think?

FAD2BLK93

I think you are shifting way to low! When u were on the dyno what rpm was the pull to?

Wicked94Z

iTrader: (26)

I made 358rwhp, I ran a 6.99 in the 1/8 in the heat 2 weeks ago. In all honesty I don't think the numbers were accurate

With that cam you should be shifting around 6800-7000 with it dropping to 5800+ on the shift. That shift extension is killing you, but raising shift points won't help it too much, you need more converter. I'd run something in the 4400 range.

joelster

Cars that trap 86 in the 1/8th are typically in the high 7's. A 2.05 60-foot isn't very good, there's a lot of room for improvement there. As far as your dyno numbers, I don't think the th350 is the culprit. A dedicated nitrous converter will be very tight and not have a lot of slippage like a loose n/a converter. Was it a Mustang dyno by chance? They read significantly lower.

TravisMcGill2000

iTrader: (2)

whats was the da? i trapped 86 with boltons. like said u need bigger stall and turn it 6800ish. i would say u should be trappin 95ish

96capricemgr

iTrader: (1)

Raise the shift point WAY up and try again.
Where was peak HP? You do realize you want to go probably 4-500rpm past peak right?

RJBAILEY84

iTrader: (4)

Very nice.. With changing the converter, how will that effect drive ability on the street.

All the power was made by 6200 on the dyno. Only pulled it to 6400 or so.

Pretty sure they have a dyno jet. Dyno numbers don't concern me that much however the track kilt me.. lol

DA I didn't check on. So not sure.

Peak Hp was around 6000-6100 then dropped off..

Here is the dyno graph.

joelster

What track?
What day?
What time of day?

We can look up the DA for you.

Wicked94Z

iTrader: (26)

I wouldn't want that motor dropping below 5500. Is the cam advanced? That cam should have a broader peak. Definitely needs more converter, a 4400 should be able to cruise at less than 2300 no problem.

guppymech

iTrader: (7)

At the top end of your dyno graph the oscillations, is that valve springs loosing control?

SS RRR

iTrader: (2)

Looks more like fuel cutoff.

RJBAILEY84

iTrader: (4)

Thunder Valley Track in Red Springs N.C.
about 7:45pm EST on the 18th of July.
Thanks..

I believe the cam is advanced, however not sure how much. It was a custom grind done through Comp Cams suggestions.

Not sure whats going on at the top end. The fuel pump was cutting out on the dyno, at 5500rpm it would drop the psi down to 30 during throttle. After that we changed the pump to a brand new walbro 255 in tank, which seemed to solve all the problems. Fuel stayed a constant 44-46lbs the entire pull which was this final graph..


Thanks for all the help gents..And keep it coming, I need to figure this **** out before I part it out.. lol

SS RRR

iTrader: (2)

Nothing looks out of the ordinary with the curve IMO. I think you should keep your shift points around 6300rpm.

RJBAILEY84

iTrader: (4)

So with a shift point of 6300, that would put me shifting at 6300 or more on the lines of 6500?

nitrous2fast

iTrader: (2)

What was your afr's on the dyno?? THe substantially lower torque number seems awkward to me.