hacker-pschorr

New Dyno Sheet Posted with DynoJet STP Correction
New Numbers (DynoJet STP Correction):
663.6rwhp
610.4rwtq



This is the same dyno run as before. The dyno operator has since unlocked the DynoJet correction portion of the software, this is the result.

Next dyno day will be some finer tuning - I'm sure 700+rwhp will be the result

Original post below

Please ignore the air / fuel curve - that was not hooked up for this run.

Details on the motor:

5.0
22psi (capable of 30psi, still tuning for that)
951 Pistons
7.5:1 Compression
Automatic with 2.54
Powered by Autronic to replace the Bosch LH & EZK
83lb fuel injectors
8 wide band O2 sensors to monitor each cylinder.
100% Stock everywhere else except for the exhaust (stock manifolds with custom duel exhaust after that)

I've had the pleasure of riding in this car many times (in it's current and other configurations). What is so nice about the supercharger setup is how tame (dare I say stock feeling) it is around town. It feels like a normal 100% stock 928 until you push down the go pedal. Even then it's so smooth it's almost scary. Todd has built engines that make more power than this one, with the stock computer's. I'm not sure what he plans for his next setup.

Right now timing is very conservative - Todd has tried many different configurations with this car (displacement, types of cylinders, stroker etc..) Since this is his first engine using Autronic, he went back to the basics to keep things simple for easier tuning. This is only the beginning.

The dyno used is a Dynocom - the same type that Louie Ott has so the calculations are comparable.

Here is a previous thread on Todd's work:
https://rennlist.com/forums/928-forum/312176-todd-s-website-is-finally-up-more-pictures-of-the-427-powered-928-a.html

Weather permitting this is Todd's daily driver. Todd has mentioned how smoothly the engine idles, and said that the guys at the dyno could hardly believe it when he told then to put their hand on the idling engine. He said he can literally stand a nickle on it's edge on top of the "P" of the intake manifold with the engine idling


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Something I forgot to mention:

Big Dave

Are those RW numbers???? Holy ****.

AO

BIG DOG!

(Yes... RWHP/RWTQ)

Mike Simard

Yikes! There goes the 600 rwhp milestone!

BC

He is back to his original stock block with low comp pistons?

If his towers are holding that much air and fuel on pump gas at 22psi, then I am sure that I could do over 17 with E85 and stock pistons.

Tim's dyno was 550 or so right? At the maxed out V-2 CFM?

I think Todd has something else going on with this. 50hp can be had with more advance at the middle right?

BC

With the size of his SC head unit, I think he would benefit from some more breathing at the intake and exhaust, right? I think the boost number does not tell us the true CFM of what is going through the motor.

Interesting.

hacker-pschorr

When starting from scratch with a new engine management system, Todd felt more comfortable with more of a basic engine.
Tim was running 17psi on that motor with 8.6:1 compression ratio. Not to mention stock timing maps (pre-shark tuner days).

Keep in mind that was on a dynojet - as Louie pointed out the dynocom's read lower (as do most other dyno's) than a dynojet. Even with corrected numbers. Is there a flat calculation for this? I have no idea - but we will find out in spring

AO

Just noticed and thought I should mention it. RWHP scale is on the left Y-axis with a scale to 700. RWTQ is on the right with a scale to 600, just in case you're wondering why they don't cross at 5252.

hacker-pschorr

Got it - thanks Andrew, added that to the initial post.

Randy V

Who's this Todd fellow?

hacker-pschorr

Search and you will find.....

https://rennlist.com/forums/showthread.php?t=312176

Fabio421

I hate to say this because its a huge #, but those #'s seem low considering he is boosting at 22psi. But still an incredible # none the less. Is this a record for 5L boosted 928's?

Since he is using 951 pistons, what rods are being used? I had asked about doing this recently and was told that the pistons wouldn't come anywhere near full deck and I would need a custom rod. Please elaborate if you can.

Great work Todd Tremel.

AO

I think he's had a couple minor issues with his gear bender, but none so far with the trans that I know of.

Good Q's on the rods Sean.

Shane

Awesome!!

hacker-pschorr

I have not seen his maps so I can only guess, but I do know this is about as conservative of a tune as you can get.

This is the first of many dyno runs for this engine, this is setup #1.

Also, if we run this car as is on the local dynojet (actually about 40 miles away, this one is down the street) the numbers will be higher. The only apples to apples conparison is to Louie's posted dyno sheets since they are both on the same type of dyno with the same calculations.
He is either using stock 951 or 928 rods. I'll have to check.
Todd has been using the same transmisison for a couple of years now, so far no issues. He uses only Lubrication Engineers fluids in his car.