I have just had to drop my CR from 9.1:1 down to 7.9:1 due to headgasket supply and deeper valve pockets in the pistons.

So driving it feels slow! gone has the super quick response, and it now doesnt pull smoothly, there are steps in the power band, and it doesnt wheelspin in 6th anymore.

However it is still on its high CR ignition map! will be remapping which will remove the steps.

Boost has fell by 1psi and EGT has fell 50 deg C.

No other changes to the car.

Simon.

 

Report back when the ignition as been put back in, along with the more boost that you can now run .

You should find an even greater reduction in EGTs .

 

Will do.

Old boost was 21psi.
Tried to up boost on 9.1 CR but ignition system could not produce enugh power.

S.

 

Si...if i told you what my CR was you would not believe me.

Low comp or in my case VERY low comp does NOT have to make a bad driving car.

Have a play about and see what I mean!

 

Oi get on with making my saph faster !!!!!!

 

wouldnt increasing the power of your ignition system be a good place to start?

 

ive gone from 7.3 to 8.4, and it's no more responsive at all - lots of ignition had to come out. Be interesting to see what yours is like with the added lead.

 

Did a bit of mapping tonight. Only ignition.

Added 5 deg of advance across all load and rpms ranges.

Result almost removed all steps in power but saw a decrease of 40 deg C in EGT.

Had to stop as snowing again.

S.

 

my compression is 6.9.0 and pretty sluggish low down the revs,but youll be able to play with that when mapping si eh???????/lol

 

get the boost whacked up Si!

 

Are you in the 6?

 

Who would have thought it?

Given the large drop in c/r, I would have thought that it would take some more ignition, but I would put some boost into it first (the amount you want to run) and then see what you can get away with ignition wise .

 

The man speaks the truth You can become a true boost junkie

 

likes he'd tell you

although col revealed his above

my rst engine from ava was LOW comp too

 

Not to worry Chops. i'll just ask Mark Shead

 

Agreed it will take more ignition.

However I am gaining info on ign, EGT, CR at the moment when I finish then will do more maping with more boost.

S.

 

Hey rich...its lower than col's which is 6.9, thats all i will say.

Mark doesnt know the exact comp ratio either.

 

Si wish you could mess around with all this on the rollers as you would see what happens to the power when you make these changes.

Its always very interesting!

 

The comp ratio is in the map on autronic, so he will do if he has ever helped with your mapping.

Not that it matters




MikeR, nice accurate info

 

If its in the map then he does know it chip....

My mistake

 

euan whats the big secret with it mate?

 

Low is good in my book

 

not a secret col...just cant be bothered with the hassle of posting it as people will only say its shite!

 

Is it 2:1?

 

Sorry but

 

1.1:1

 

Awesome, that was gonna be my 2nd guess

 

Got to be around 1:5 for proper low comp.

 

How you could think anyone would say its shite given what you car has achieved is beyond me lol. But still, it doesnt really matter, i was just interested to know

 

i reckon its 6.3:1

fuck what people say about high comp enignes, they all blow up lol

mine is 7.77:1 btw, wanted lower but not enough meat on the pistons to be safe with mega boost to take any more off

 

Dan at a figure of say 400hp what pressure you planning on running and when you up Pro Alloy i have to go there shortly too.

 

all of it lol

dunno, whatever the engine can take.

my boost gauge will only go up to 30psi tho lol

ill next be at pro on the 29th to collect the car, and take it to hayward and scott, provided i have sorted the manifold by then, else it will be going to reyland lol

 

Fuck what some of the wahoo's on here say Euan,at the end of the day check the stats in your sig and that says it all!

Will ge you a buzz over the weekend by the way mate,could be needing a wee favour regarding heating! By the way was reading the Crail post and if you still need a lift to Macdonlds in the morning then let us know mate

 

cheers Keith!

See you at mcdonalds

 

Rich, Rod has already informed me that we are stuck in the 80's fro running low comp and using T4's so you can see what I mean.

Doesnt matter if the car runs 188 mph in the wet with a fucked headgasket or not its not in fashion so it will never work!

 

Yip euan filling up at the petrol station must be slightly less annoying than paying for rocket fuel, filling and checking your nos and nitrogen and then having to check the water/methanol mix in your water injection.

 

lol

 

Such a complex subject...

 

i could prob put normal 95 RON in it and it would still be fine

 

how long until you get the car back euan?