Mopar Muscle Association UK

GTXJim wrote:See you tomorrow, And i'll get you a coffee

White, No sugar please fingers crossed

blown360 wrote:Hey good to hear youve had some good results mate!How are you running the butterflies now?Back to 4 or still with 2?Is it not possible to run the tps at 0% idle and adjust idle on the flutterbies?

Running 2 out of 4 Butterflies, centre 2 are sealed

I have set the max TPS at idle to 5% on the Operating Parameter Config

Atual TPS on Butterflies is set to 4%

@ 1.5% TPS idle, motor was 2,000+ plus

@ 0% percent TPS Idle, situation would be equal or worse

Butter flies are fully closed on idle, approx 0.004"-0.006" clearance around blades

Hope the trip out goes ok Mark. Good luck

Pete wrote:Hope the trip out goes ok Mark. Good luck

Thanks Pete

Hope you get back ok

Well haven't touched for almost 3 weeks, thought a break away from it, would help & fresh start would help me think more clearly.

I played around again with the hat / throttle blades yesterday and am convinced I can not get any better than they are currently set.

Started from a clean sheet & remapped the whole F/Inj system 40 cigarettes & 40 cups of Coffee later, now feel comfortable on that side.


Had a friend round today, so it made it easier to see what was happening. Noticed that the butterflies were being sucked open, due to the blower pressure. So we re made the spring mounting plate to change the spring ratio & will need to make something similar & permanent for the opposite side of the hat. As the inner shaft is affected by a torsional type twist.

Also had another air lock in the water system, which wasn't helping as the hot spots were given the F/Inj false information.

With the combination of all the above work the engine is now idling at around 800rpm I can't explain what a very happy bunny I am at the moment.

Just come in to watch some of the Grand Prix & some dinner, then back out in the garage with my cornflake box cardboard to make new spring return template.

Tues I am booked on the rolling road, so have a good baseline now & should be able I to further refine the motor some more & on the road in general.

800rpm, I bet youre happy
Great stuff Mark, it's getting there....rolling road results should be interesting.

That sounds very promising now.

Something to be said for"STOCK" motors

Reliability is the KEY.........................

R.RUNNER wrote:Something to be said for"STOCK" motors

Reliability is the KEY.........................

Whats my problems got to do with reliability, mine should be more reliable than had I gone with carb's.

Just to put the record straight, I have nothing against carb's & know a well set up carb will equal any F/Inj. Its just that the carb is not as good as handling all the various changing aspects without adjustments.


For me, It was just more of a steeper learning curve than what I was expecting.

The positives from this lesson is that I now have taught myself & I am no longer reliant on others. No I am not an expert either, but hope I will enhance these skills the more I play.

mopar_mark wrote: For me, It was just more of a steeper learning curve than what I was expecting

One of these curves, was getting my head around how a 572ci Blown engine, can pull 4,000+ rpm with ease, with an air gap between the 4 butterflies, which had a total surface area less than than 0.040"

Well done Mark for stayin with it , sounds so easy when you explain to others the problems you've had to deal with & the fixes you've made , the hard part is finding the problems to start with , hats off to yer.

Think i'll stick with the spray , leave all that techi FI alone.

Brutus wrote: The hard part is finding the problems to start with

Yes mate, takes about 5 mins to explain what you have done, hard to explain the umpteen days & nights to get to that solution.

Its all very well having a Blown EFI Hemi, but not too many people to speak to that can help, well that's not strictly true..... but you get my drift

Similar to you getting a handle on the Nitrous, its easy once you have found what to do, but bloody mind boggling sometimes to get there

Brutus wrote:Think I'll stick with the spray , leave all that techi FI alone

Hey Brutus, come on in the waters fine

Hey Mark, any chance of geting some video of your time at the rolling road?

Pretty please