Benton

You gotta open up the exhaust, I think you would see some pretty big gains there.

hacker-pschorr

Ok - good to know, very interesting.

Neither, Dyno Dynamics is the brand:
http://www.dyno.com.au/dyno/controller

There is also Superflow, Dynocom, Dynapac....all have their own formula.

From years of collecting graphs & dyno files, Dyno Dyamics tend to run a bit on the high side along with Dynapac's, which this test confirms:

http://www.modified.com/tech/modp-09...n/dynojet.html

Same car, 5 different dyno's:
Dyno Dash Round-up (SAE J1349)
Fame Mustang 292.7
Drift-Office Dynojet 312.5
English Racing Dynojet 315.9
Pina Dyno Dynamics 318.6
Speed Factory Dynapack 324.4

So much for the myth Dynojets are always the highest

This is all irrelevant as long as you use the same dyno (or at least the same kind) for the before / after tests.


IIRC Jean-Louis 4.7 EuroS CIS put down about 276rwhp on a DynoJet. That was with headers and dual exhaust.

bronto

Anybody else notice that the dotted line looks sort of like the silhouette of a 928?

soupcan

http://my350z.com/forum/vq35hr/40554...s-dynojet.html

Three dyno's 34hp and 60tq difference between them.

hacker-pschorr

That goes right with all the other sheets I've collected.

From that thread:

Mustang - 306whp / 254ft-lbs
DynoJet - 311whp / 260ft-lbs
Dynocom - 340.9whp / 315.0 ft-lbs

Just more reinforcement to pick a shop / dyno and stay with it.

LostInSpace

Joel,

Pleased to see progress on the car and looking forward to further updates.

Out of curiosity, who's going to build the exhaust? I've spoken to Zero Exhuasts in Kent for a full stainless, 2.5" dual mandrel bent X pipe back system for my GT. They come highly recommended, but aren't the cheapest, nor local.

mark kibort

I am totally confused. what is the manifold you have on the car? is it euro , or a real US 86.5 US 4 valve manifold, as you seem to convey by the original post?

we commonly get 250rwhp even with Ljet on a 4.7, but need to get a 5 liter with that euro config go get near 300rwhp. oh, you said it was scaled up due to not being wheel? more confusion. just post rear wheel hp ALWAYS, and then you can mention flywheel based on 15% or whatever.

so, what are the mods you have, or is it just a 4.7 with 282rwhp, which is really good by the way. proving to me that the CIS system is really the difference. what is it that roger sold you? something modified to the intake?

mark kibort

gains for exhaust is about 10hp for headers and 10hp for open exhaust

I saw not much change for running a mustang vs dynojet. 318rwhp vs 320rwp at the time, on the Holbert S4 5 liter stock with equal length headers, 85 cams, etc.

GregBBRD

If that is real wheel horsepower, that would be great!

Tom. M

I think the dyno dynamics graph in "shoot out" mode is basically a conversion to what dynojet numbers would be (approx. 15% on top of the standard dyno dynamics mode)...

The dyno dynamics unit we used here (when it was still here) tested lower than the equivalent Dynojet on the same car..

Lizard928

Joel has had bad numbers in the past from this motor, so that is why he thinks that these numbers are good.

But unfortunately the british shops never seem to want to give RWHP figures.

I think that 300BHP is taking in a correction factor of 17% iirc.
That would be about 256 RWHP

123quattro

Getting the WOT switch to work on mine was worth about 40whp. It went from ridiculously lean to perfect A/F at wot. Transient and part throttle is another story....

Dave928S

I took it that he got rid of the original cast exhaust manifolds and put on 32 valve 86.5 SS standard two bolt manifolds, which are a bolt on replacement for the cast boat anchors. They flow a bit better than the cast, and so are a cheap bolt on improvement, without going to headers. It's obviously second best to headers, but no one mass produces them for RHD cars. You pay $$$$ for custom made RHD headers or do what Greg did and make them yourself.

Outside the US we have to make do without some things that you regard as standard bolt on, like headers, or pay an arm and a leg for shipping from the US or getting them custom made.

Reading your post again, you thought he was talking about an intake manifold.

mark kibort

thanks! Yep, I was thinking he was talking about intake.

hopwood

As cleared up below Mark, the intake manifold is Euro S, the exhaust manifold are upgraded to 86.5. The motor is Euro S2 4.7 with KJet, the exhaust is original from 79 (it was originally a 4.5 240bhp).

Will post up the wheel numbers with the new scan. Peak power was 260rwhp.

Joel