slate blue

Hi Brett, please email the dyno chart. Has your chart got the air fuel ratio on it?

Brett928S2

Hi GREG

Emailed charts...and no A/F on mine...but mine ALWAYS runs rich...and that chart was before I got a new MAF from John Speake....

All the best Brett

mark kibort

'Wow, that is interesting. surprising that the power isnt more. especially since that is only about 15hp over scots 4.7 euro with Ljet (40% restrictor) however, fuel is almost perfect on scots and yours is drowning! you got 300ccs more and that HUGE MAF. i also have to wonder if you dont have a cam timing issue as well.

the only other difference is the dyno type. was this a mustang type dyno, or a dyno jet 248e.

what have done with the dual fuel regs. are both now RRFRs or did you block the return of one, and just use one. if your fuel is too rich, i would put two stock fuel regs back on and see what you get. Or, if you are using one and blocking the return line, replace that side with a stock regulator .

dont get so caught up with the total hp, look at the curve. notice that your peak is at 5600rpm. and then it just is flat. if you correlate that with the fuel mixture, you see you are at 10:1 at that point. the engine is drowning after 5500rpm. fix that, and that should be easy, you are on your way. if you didnt have 10:1 at near 6000rpm, you would probably have 20 more hp there!

mk

Raceboy

Just use a standalone, install is a breeze on 928 that has LH-Jet. As a bonus you'll get new wiring harness, more modern ECU with far more processing power, features and of course, more power.

Did I meniton that coil-on-plug setup looks really nice and clean on 928?

I did this on my friends Euro 928 S and it runs like a champ.
To reveal some very near future plans, I'll install an ITB setup with tuned length runners and nice headers together with X-pipe. Should get some nice power out of it not to mention killer throttle response.

Peter F

Raceboy,

what coils did you use for this setup?
Any pictures of the installation to share?

/Peter

SwayBar

Greg, can you list or provide a link to everything you did to the engine?

I'm with Mark, go after the low-hanging fruit by cleaning up the AF/ratio first and foremost, and then proceed from there.

Raceboy, very interesting!

mark kibort

This is really where to start. it should be no problem to get the air fuel ratios near 12 or 13:1. let us know what kind of fuel regulator set up you have with the LHjetronic euroS 84 set up and the 5 liter.

one way to do this also is to try and introduce false air around , or bypassing the maf. a little trickier.

MK

Raceboy

Here's a thread about the installation: https://rennlist.com/forums/928-forum/296704-starting-stand-alone-install-on-86-4-7-a.html

slate blue

The car feels good, power very linear, I think I will put a set of mild cams in it as it only has the early S cams, the K jet cams that is. I think if you look at the top of the sheet it is quite feasable to achieve 330 or so RWHP. Also the dyno dynamics dyno reads low when compared to other dynos and I was told go down the road and that guys dyno will give you 315 rwhp. I'm not into that but it is interesting to know.

Also it was interesting that no smoke filled the room like some of the other cars did, although a S4 was also very good. I think it shows the crank scrapers are working well, oil consumption is almost none existant.

Bill Ball

Good work!