LOW DYNO #S (3.3SS EFI/PMO ITBS EURO HEADERS M&K muffler

[KNIGHTRACE]

My final opinion I would cc the motor to see the actual compression....... I ordered a set of 10.5:1 pistons and they were only 8:1 when I checked them by volume... these numbers are way to low to be a simple problem in my opinion. Kevin is accurate in what he is saying I personally would love to have the car for about 3 days to see the actual problem...

[nippy]

Agian how about a faulty dyno guys? Anybody anybody bueller beuller?

[safe]

Originally Posted by nippy

Agian how about a faulty dyno guys? Anybody anybody bueller beuller?

Possible, but far fetched I think.
How does the car feel when at full throttle past 4000?
That engine should come "on the cam" about when it loses torque in the dyno plot and really take off. It shouldn't just feel strong like a stock 3.0, it should be an animal.

Do a rolling start drag race from 30mph or something with another car of similar weight and compare based on power.

[Tippy]

Not sure if it's been asked, but what about the clutch? Slippage on mine seemed to plane out, but throwing out there.

[lvporschepilot]

Originally Posted by nippy

were doing just that after we tie up the loose ends. Everybody is thinking the dyna paks were just off. The car feels good and pulls well up to red line but could use a little fine tuning. I think I just freaked out at such low numbers but now it's starting to look like the dyna machine/tuner were faulty along with a few previous mistakes with the itb and efi install.

Good to hear. The Devil is in the details. For me, I only use a dynojet as they are the most consistent and seems to be the industry standard. Granted a dynojet is an inertia dyno, so things like wheel weight do play a factor, but one can still get far closer with one and have the ability to compare to others easier due to it being a more widely used dyno without correction inputs. Other dynos offer too many correction inputs and factors and what-ifs which can throw that data off. Might want to start the pull at like 3500 as well just to see

Please keep us posted.

[blockhed]

Originally Posted by Tippy

Not sure if it's been asked, but what about the clutch? Slippage on mine seemed to plane out, but throwing out there.

Mentioned it a while ago I'd say it's safe to check and get it off the list

[KNIGHTRACE]

Another test to see what your making is a simple 1/4 mile acceleration test.. I have several of my clients take there car to the drag strip and run them... Pauls 3.4 carb motor in an SC with stock gears ran an 11.94 in the 1/4 mile.. his reaction time was .4 seconds, the weight of the car with him is about 2575 lbs to 2600 lbs.. It is easy to calculate the power of the motor with known weight of the car and time through the quarter mile. I feel this method is plus or minus 3% accuracy. There are apps for your iPhone that are GPS based if you have a safe legal place to test the car and you don't want to go to the drag strip..

[Ken911]

Originally Posted by nippy

Agian how about a faulty dyno guys? Anybody anybody bueller beuller?

so did you ever get a chance to put it on a different Dyno and find out what you are really getting?

[nippy]

Its back at the shop to work on the throttle. They said they estimated the car is only getting about 80% throttle. Also doing a leak down test. Securing the wiring harness. Still wanting to re tune after all this is corrected and get somebody who is versed in AEM infinity.

[Ken911]

Oh ok

[lvporschepilot]

Originally Posted by nippy

They said they estimated the car is only getting about 80% throttle. .

Interesting. Are they saying the butterflies aren't opening completely?

[crashmy911]

Pull muffler off and run it

[Tippy]

Originally Posted by KNIGHTRACE

Another test to see what your making is a simple 1/4 mile acceleration test.. I have several of my clients take there car to the drag strip and run them... Pauls 3.4 carb motor in an SC with stock gears ran an 11.94 in the 1/4 mile.. his reaction time was .4 seconds, the weight of the car with him is about 2575 lbs to 2600 lbs.. It is easy to calculate the power of the motor with known weight of the car and time through the quarter mile. I feel this method is plus or minus 3% accuracy. There are apps for your iPhone that are GPS based if you have a safe legal place to test the car and you don't want to go to the drag strip..

That's 300 hp give or take. With a 915 trans (that everyone claims are hard to shift quickly), that's a phenomenal ET!!!

For reference, my 20lbs of boost 3.4 with G50, I only managed a 12.02, and I'm a very skilled drag racer with dozens of passes on my 911.

Yes, slicks and boost off the line would drop this number significantly, but I did have new 285 tires with ok traction for street tires.

I'd love to see this combo.

Something tells me it's a 12.94? If not, damn!! Kudos.

Sorry to hijack.

[blockhed]

Tippy PM your time slip I'm curious.
Any updates on this car and a fix.
Ps. Mr. KNight builds some crazy engines so I wouldn't put it past him that 3.4 is over 300 hp

[Trackrash]

I agree, that 1/4mile time sounds amazing. I would like to know the details of the trans. 915? Gearing? Dog teeth?

So a 12 sec 1/4 would be about 120mph at the end. So the would mean three shifts.

Edit, I am trying to QUOTE Tippy in #73 and respond. For some reason clicking on the QUOTE button does not bring up the QUOTE link.

[Tippy]

Search the 930 forum. The title has something to like "almost 11's on street tires"...

Quote doesn't work on my mobile...

[nippy]

The guys are still going through the car and will be doing a dyno run this week. So will know more soon guys. I'm obviously not the most technical when it comes to engines and internal so I apologize for knowing some answers to your questions.

[Tippy]

Good luck finding root cause!

[KNIGHTRACE]

Tippy, Paul Ivey is my client, his email is (motoracer_77573@yahoo.com) He has the 3.4 SC in Houston, He ran his SC at Royal Purple Raceway in Baytown on a hot summer night about 6 months ago.. 11:94 and he has the time slip.. I listed his email above he is a good guy. Beautiful car maybe if you guys email him he will upload some photos and time slip.. It is a stock geared 915 with TQB diff. He is pretty good with the 915, better than I am... I would appreciate someone to reach out to him fo some photos.
William Knight

[Tippy]

Originally Posted by KNIGHTRACE

Tippy, Paul Ivey is my client, his email is (motoracer_77573@yahoo.com) He has the 3.4 SC in Houston, He ran his SC at Royal Purple Raceway in Baytown on a hot summer night about 6 months ago.. 11:94 and he has the time slip.. I listed his email above he is a good guy. Beautiful car maybe if you guys email him he will upload some photos and time slip.. It is a stock geared 915 with TQB diff. He is pretty good with the 915, better than I am... I would appreciate someone to reach out to him fo some photos.
William Knight

That is really impressive. Heard you build some mid/high-300hp motors. That explains why they're so quick. Was assuming this was a simple lightweight, slightly modded 3.0. See this is not the case.

Being a 915 car, I'd imagine it took at least 350 hp to achieve the time?

I might reach out to him. Thank you.