ATMO Tuning

It is a known trait of this engine that the torque curve of the V6 will be going DOWNWARDS from 4k onwards,

Prove it.

Easy..

Standard A610 makes 258lb at 3000rpm at only 10psi

Tony's car made 252lbft at 5000rpm at 14psi

252 @ 5k is less than the standard 258 @ 3k, AND it was running more boost, therefore going downwards.

Now, Now boys! R we gonna see handbags?!

I thought the car was 300+, maybe I miss read a previous post, after all there are enough of them

Now, Now boys! R we gonna see handbags?!

No i think its probably done now....David seems to win every time....bloody know it all!

Now, Now boys! R we gonna see handbags?!

Rather that than manbags

Now, Now boys! R we gonna see handbags?!

No i think its probably done now....David seems to win every time....bloody know it all!

In the land of the blind.................le gentilhomme avec une oeil est le roi

I find it very amusing that everyone except me is so bothered what my car puts out! To set the record straight - there are no graphs and no exact figures at present. The car was off the 240bhp at the wheels scale at about 5000 rpm, possibly quite alot off the scale as traction on the rollers was a problem. As everyone who knows me will confirm I never make exagerated power claims as its a sure way to get egg on your face. I'll be having some more work done on the map now its running better (thankyou Martin) - (coil pack shares an earth with the back lights and one was shorting in the light cluster causing the engine spark to do strange things!) probably in the next month or so and will provide full graphs I hope (famous last words.) What I do know is that it feels very quick. At 1 bar and the mapping leaving something to desire it feels substantially quicker than an A610. I've owned and driven a lot of quick cars and my gut feeling is the car is making 310-320 bhp at present at 1 bar. I don't understand why its unreasonable to say it has over 300bhp when 240bhp at the wheels (not at peak power remember) must equate to that - I've had my car on plenty of RR's over the years and its always lost 50-60 bhp. What power would you expect an A610 to put out running 3 psi more boost over standard with better exhaust, induction, chargecooling and a substantially bigger turbo considering they make about 260-265bhp on standard boost with the cat removed

A610 puts out about 285bhp at 1 bar, so I'd expect Tony's car to be around 300 at present..

I queried what Martin had written because he had inserted a figure of 360bhp into a piece that was a blatant advert for his business!!! He then went on to try and justify how your car had 360bhp!!! It was clearly an invented figure with no basis.......you might get 400bhp I dont know...but it would be nice if any figures that are posted are based on reality not some guesstimate!!!!

i wonder what is the possible max bhp for the atmo configuration......i belive the factory saw 430 in an a610 from the 3 litre PRV in twin turbo format ...... if this is still the benchmark for the engine, i guess the normal asperated ver. would stuggle to meet it


"i know nothing....but i hope to learn something"

i wonder what is the possible max bhp for the atmo configuration......i belive the factory saw 430 in an a610 from the 3 litre PRV in twin turbo format ...... if this is still the benchmark for the engine, i guess the normal asperated ver. would stuggle to meet it


"i know nothing....but i hope to learn something"

Depends how far from the original engine you want to go. 330bhp was done in the GTA Production racer, 350 has been done recently with the 3.5l capacity upgrade, 480 has been done on a biturbo 610 engine, 900 has been done on a 24v Lemans PRV biturbo.... far from the original engine though..

I queried what Martin had written because he had inserted a figure of 360bhp into a piece that was a blatant advert for his business!!!

It genuinely wasn't meant to be, so I apologise unreservedly for that. It was more an attempt to show that although my business says "DeLorean" over the door, I've been doing a fair bit of Alpine stuff and wouldn't mind a bit more seeing as it's the engine work that I enjoy most. *although I had nothing to do with Tony's engine, only the ECU*

I've not been on the forum for a few days because I was at the NEC classic car show.

As far as Dave "always winning", I would prefer not to say anything if I can't be polite. End of the day, theory is a great start, but you don't half learn a lot by actually -doing- stuff. Specific to this thread, I've thrown hours of work away at performance stuff on the Atmo engine (the DeLorean engine is identical apart from carb vs K-Jet). I've built/rebuilt 5 Atmo engines so felt I was fairly well informed on this thread. As to the specifics of the maths, I know there're a lot of holes in my theory and that's one of the reasons I'm hoping to go back to university next year to do another degree because I want to learn it properly

Somehow a throwaway comment segwayed the entire thread into an argument over Tony's car, and it did feel rather odd! Sorry, Tony!

...and to return to the matter in hand with a grating of gears, Kevin at GTO has achieved 260ish from an Atmo 2.7 with a -lot- of work including electronic ignition. I believe he has a 3 litre turbo odd-fire 12v knocking on 600hp. (figures from memory)

End of the day to get those sorts of figures, you have to replace just about all the internals. What matters is the block and liners and odd-fire crank will take it.

I've built/rebuilt 5 Atmo engines so felt I was fairly well informed on this thread. .

I think you'll find the guy wanted knowledgeable specifics on getting more out of his engine/setup. Saying things like changing the cams, carbs and putting a free flowing exhaust on are easy to say as they are just generic mods that will work on any engine, it may as well be a Nissan or a Ford, hence why I put the specific tweaks that I have tried and tested in the past.


No drama..