slate blue

Guys as promised I dynoed my car today, it is a disapointing result I have to say as the power is no difference between this engine and the other 4.7 litre. Maybe it will loosen up a bit later as it has less than 1000 miles on it.

mark kibort

your prior 4.7 was 275rwhp? and it was a true euro 4.7 1984?

drowing the car out in fuel could kill some hp.10:1 is pretty fat. could be worth 10-15hp .

the other thing that could be an issue, is the exhaust. If you are running the cast exhaust manifolds, why would you get more than 275rwhp. heck the 4 valve S4s usually run 270ish rwhp. the hotter cam version 85s get less than this. Ive heard that the 84 euros 4.7s are in the 275rwhp range with a set of headers, but i dont think ive seen a dyno.
my 4.7 US to euro conversion , still Ljet, made 242rwhp
with 5liter and the euro heads, 293rwhp, but i had many runs in the 285range. (also still Ljet)

so, what was different between this dyno run and the ones you did with the euro 4.7. was the only change the 85 5 liter pistons? are you sure it was timed correctly? did you do a compression check ? How did you get it to run so fat? RRFR?

I would think a euro 84 with a MAF system would make near 300rwhp without too much fuss, but i think you need an exhaust system to take full advantage of the 5 liter.

edit: i noticed that you did the run in 3rd gear. should always do your dynos in 4th. thats worth about 5-7hp right there. by the way, the engine will not loosen up. not with 928s! my 5 liter part euro with Ljet, made 293 at a peak and a year or two later was still in the 285rwhp range, with equal length headers.

just lean out the mixture and see what you get. dont think there is much to be found with cam timing. if you got it so fat due to fuel regs, just turn them back.

Mk

slate blue

Mark you make some very good and valid points, the engine is equiped with my hand made headers and the primary pipe diameter is 1 3/4". I also have a duel 3" system with a variable pressure bypas valve. So the bottleneck is not there. The previous runs were 272 rwhp and 276 rwhp.

Shane

It will come to its' own when you get the fueling right. John Speake is working up LH2.2 sharktuner as we speak, that will help bring out some more potential.

"heck the 4 valve S4s usually run 270ish rwhp. the hotter cam version 85s get less than this."

Mark, my 86.5 did 281/278 with just chips, you must be refering to the autos or something.

Raceboy

You lose many valueable horsepower to that 10.5:1 AFR ratio, especially on normally aspirated car.

John Speake

Hi Greg
Don't dispair ! I'm sure there is more power to come....

The SharkTuner for LH2.2 is coming on well, the first version will be for US 85/86 32v. But your car is an 84 Euro ? What is the part number on the LH box ? I ask because there is a substantial difference in hardware and software for the Euro 84 LH box compared to 85/86 Euro and US.

Beta testing of the ST LH2.2 will happen in the next couple of weeks.

John Veninger

Greg,

What is your fuel pressure? The AF line looks way to bumpy
Did the 4.7 run that rich? Try going back to the fuel setup you had on the 4.7, get rid of the RRFPR for now.

slate blue

Thanks to everybody else too, the other thing I forgot to mention was that my Flex a lite fan controller failed while on the dyno, I don't know if it got hot because of this. Of cause they have their big fan they place in front of the car but that may not have been adequate. The controller failed because the fuse blew. Its working now.

John Speake

Hi Greg
When you have a chance, get the 928.618.123.XXX number from your LH ECU.

The LH2.2 SharkTuner should be available in the next month. Either incorporated into future orders if required, or available as an upgrade to existing LH2.3 SharkTuners.

BeerFish

Am I reading this correctly? Mark, you are clarifying his statement correct? Then stating the EURO 84S is 275HP?

The EURO, 84S, 4.7, 10:1, is 310HP.

John Veninger

rwhp= Rear Wheel Horse Power, not crank horse power

mark kibort

275 rear wheel HP = about 325flywheel rating.
the euro 84 is 10.5:1 compression too, as well as 310hp flywheel

Mk

mark kibort

i was refering to ball park numbers. S4s and 85s seem to be in that range. most 85s without chips are in the 250 to 260 range. lots of S4s are in the 270ish range (stock) .

point is, there are subtle difference between the 5 liter and the euro 4.7. just shows that their cam and intake on the 2 valve euros are pretty darn good! (plus no cats usually)

I think two things. get the fuel leaner, get some headers, and it will be just fine. If i got 285 to 290 with my Ljet version, but 3.5" exhaust and equal length headers, i bet the restriction of the Ljet AFM vs the lack of headers is the trade off. theoretically, if i can get 290rwhp with an AFM which is a 40% restrictor plate, 15 hp should be found by using a MAF.

you can get that thing leaner by using a second RRFR, or put the stock fuel regulators back on. even at their lowest setting , using two of them, i think they boost the fuel pressure by 10%. However, your 4.7 runs were pretty rich too, so it may all be due to the exhaust. remember the part euro 4.5 liter that didnt get much gains with the euro intake and throttle body? stock exhaust was probably not allowing the engine to make the additional hp.

Mk

slate blue

Mark both runs were done with headers, the headers are 1 3/4" in the primaries. Then dual 3''.

Cheers Greg

Brett928S2

Hi Greg

That chart looks remarkably similar to my 4.7 euro in 2005 Before I added Nitrous..

I got 284.2 rwhp and 296 ft lbs torque...

Cannot show graph here as not member but can email it to you if it helps ?

p.s If that second line is torque,,,its appallingly low ..compared to mine...and we do ours in UK in THIRD gear as 4th is too fast for rollers...

All the best Brett