111 leaded octane

[itsa260not240z]

Need a good ratio to put in my 1974 260z 111 is a bit much and need good ratio to thin down a hair with some 93 octane thank you

[evildky]

if you're running a carbed motor with a manual pump the leaded and unleaded won't mix very well and you won't get a consistant result. Why do you need high octane? 93 is good for most n/a application up to about 10.5:1, beyone that there are race gas selections of lower octanes and with the choice of leaded ro not.

[itsa260not240z]

Well its just a test if you knew the people who have worked on my poor coupe' before i found her and its come a long way sence then. And have not been inside side of the motor so the chance of the head will be coming off if i dont see an improvement in the way it runs. Rebuilt carbs (webers) new dizzy from a zx full exhaust hot cam when i bought the car i put the rebuilt carbs on it an the dizzy. New timeing chain like six months ago gonna flush system for new alum raditor so this is just a test cause i dont wanna pull head if its a issue in that or rings which it shouldnt cause it dont use oil

[evildky]

Which rebuilt webbers? The DCOE's are a PITA to tune, as are the DGV's, I've had better luck with the tripple DCOE's than the dual DGV's. What bock do you have? which head? which carbs? have you tried SU's? they are by far the easiest to live with but don't offer that top end excitement like the DCOE's and the DGV's are not worth farting with. Have you done a compression test? have you verified the cam timing? ignition timing? did you plug the vac advance on the distributor when setting timing? did you remember to hook the vac advance back up after?

[itsa260not240z]

I have the dual dgv the e88 head dont recall the block. I need to do compression test. When i get time i have ae31 head an f54block to have redone... But i did plan on compression test tonite an getting a vacume gauge to further tune
carbs an i have some su to have rebuiltif an when but it dont smoke an it pullsreal hard so there can not be any thimg to major wrong with it???

[evildky]

My big issue with the DGV's is that they puddle fuel in the adapter eldow's at idle then get real rich when you accelerate.
E88 head has more volume than the E31, so your compression cant be higher than a 9.8 and thats if you have an f54 flat top block.

So the car "pulls real hard" whats the problem? bad idle? those DGV's are tough to tune.

[itsa260not240z]

Yes bad idel an i always had the idea that was a prob that the elbow made to hard of a turn an that something was amiss an i have some su needing rebuilt an i really want triple side drafts if i get the money but yeah i can get it all to do what i want but not idel the way it should

[evildky]

First thing I'd do is ditch the dgv's cheap used round top SU's are a bargain and can still be had for around $150, much cheaper and easier to deal with than the tripples. You also need to verify your cam timing and check your ignition timing. It everything checks out the carbs gotta go.

[itsa260not240z]

Well timing chain is new well all front timing set is new so yeah carbs gotta go money would not be an issue so either su or tripple carbs but su carbs would be cheaper but they need rebuilt an i have not heard to much bad on triples. But i need what would work best with the cam an im not to sure on su carbs with a stage 3 or 4 cam

[evildky]

SU's can and will work on anything, you might give up a bit of top end but they tend to have better bottom end than tripples. Find a decent set of used SU's and bolt them on, you can make sure eveything is working as it should then when you upgrade to tripples you'll know the only thing they need is tuning.

[itsa260not240z]

Thank you i tend to get my su rebuilt.... Thats why i bought them for classic z power for tripples are not there in my price range yet but they shall. For time i will weed out probs in what i own