rx7vadim

Just wondering how much power to the wheels in a holley 650 and a S. port. to the wheels?


I know that carb isnt as good as fi, but ive read it outperforms stock fi setup.

Stanello

iTrader: (1)

Never messed with a carb setup, but I'd guess 150?

I'd bet you actually lost power by ditching the stock intake manifolds.

Hypertek

iTrader: (3)

not worth it in my opinion.

rx7vadim

Could it make 190 whp and get atleast 15 mpg?

i dynoed 149 on 93 octane, leading coil onlym and bad rear brakes.

glhs0867

A 650 is too large.

My good freind has large streetport, 13B with a 630 carb, with custom bores. Its on a J-tech manifold. He is running, so rich your eyes water non stop.. I totally destroy his ported car, which is a 87 base.

I would always go for a smaller carb, We have found the 630 is too large, for max performance, from a SP engine. it needs to be right around 570.

I would go back to FI, I have got complete manifolds S4 & S5 and all bolted together, TB still on and everything,. if your into swapping in more HP. Let me know.

Good time to tap that 5th injector, for that extra 125 horse to wheels...

LaSkt9

wayyyyyyyyyyyyy to big of a carb

Evil Aviator

Probably not. A street ported 4-port 13B with a Holley 600 is only good for about 195 at the flywheel. The 650 will probably work OK, but as stated by others, it is a bit large for a street ported engine.

If you are looking at potential, you should be able to get another 15 hp or so out of that carb and port job. The rule of thumb is that the trailing coils add about 10% horsepower, so the engine is probably currently tuned about as well as it is going to get without the trailing coils. If you want more power, the 650 is perfect for a bridge ported engine, and will produce about 255hp at the flywheel in this configuration with a noisy exhaust.

texFCturboII

iTrader: (17)

where are the puerto ricans?........

junito1

Just to let you know my fellow Ricans use holley 650's in there n/aFULL BP 12a's..

SO its not too big..

rx7vadim

i think im going to try holley out.
Would be nice to beat some standalone rx7 with a holley lol.

i want to go blowthrough in a few month. Maybe itll will make a lil less power then ems.
12psi on holley probably =same (hp) 10-11psi on ems,

junito1

not all carbs are boost friendly. MAny need to be modified.

Evil Aviator

The power gain mostly comes from the manifold and tuning, not the carb. Given the same competency of tuning and engine block, you would not be able to beat somebody with a standalone if they have an aftermarket manifold and ITB kit. You need to compare apples to apples.

Yes, and carb tuning a turbocharged car is an absolute nightmare. I would rather work weekends at McDonald's until I could afford a cheapie Microtech EMS rather than waste my time trying to get an outdated system like that working well.

torch'd

^ its only a nightmare if you do it wrong. lol i've had both draw and blow through. iwth a built carb it really aint bad at all.

mwatson184

I've put down 430 WHP on a modified holley 600, and a MPt70. The car idled find and was a beast under WOT, but it took me a few days to get the drivability right. I can't tell you how many times i had the metering blocks out redrilling the PVCRs and rejetting.

A 650 CFM carb will work, but it will make drivability tuning even more difficult.

junito1

My bothers old 12-T was a drawthrough. ANd it WAS a pain in the *** to tune.

It was too rich on the lower rpms and wouldnt clearup.. BUt when you got past 4-5Krpms she took off like a rocket.

PHRX7

iTrader: (2)

Has anyone here used the RB holley 600 on a 2nd gen. Would like some feedback on it. Planning to put one on my 88 GXL. I looked at some of the threads and the controversy about the whole EFI vs Carb. If u can show some pics that would be awesome too.

glhs0867

Have you been reading this thread?

600 is way to large for a stock port 13B...
600 is way too large for a SP port engine....

it doesn't matter, if its a Holley or some other brand reworked. Try something around 510 cfm and should be spot on, with some headers.

Evil Aviator

I would argue that it is only a nightmare if you care about doing it right, lol. I am sure it is easy if you are satisfied with only basic tuning, such as would be the case with a drag car that only needs to run correctly at idle and WOT.

Actually, Racing Beat recommends their Holley 600 for a stock port or street port 13B. Granted, most low-budget street setups would probably run better with a slightly smaller carb, but nevertheless that is what the vendor recommends for their product.

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/racing-beat-holley-carb-setup-running-poorly-497471/

g14novak

iTrader: (1)

I'm running a Jay-tech to a Holley 660 on a stock 6-port. I haven't had it dyno'd. It does run pig rich though. Riding behind me is like getting maced.

I had a mechanic modify my carb. He changed out the jets and did a few tricks.

I do admit EFI is alot better. Don't bother modifying the carb setup, go back EFI.

glhs0867

Wonder why Racing Beat would recommend such things, when they don't work the best in the real world?


Seems like they are keeping others in the dark, So they can keep ahead at the track???What??

I want to see track numbers, not dyno numbers. Thats tell the true story...

mario1386

racing beat recommends its ,but using their holley cause its jetted and reworked for the rotary engine .

Evil Aviator

I am guessing here, but I find two likely explanations:
1. They base their recommendations on a properly tuned race setup, while many people who order their carb kit "in the real world" are poor tuners with rattle-trap steet cars that have a lower airflow requirement.
2. They only offer a few carb sizes to keep the business streamlined.

The entire reason they reworked the Holley carbs was for the track, so I would not worry about that too much.