turbo charging with a nikki carb
02-28-03, 04:46 PM
#26
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Turbo 12a- are you talking about a 12at which you have converted from efi to carb, if so have you fitted a Nikki carb and what were the difficulties in installation and how does it perform? Robert says its possibly if you modify the hood, what is your experience with the intake plumbing?
02-28-03, 05:54 PM
#27
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everyone is saying how hard it is, but no one is saying the problem with it..
if i were to go out and put a turbo in the car and direct it thru my stock nikki.. what would happen?
would it start? would the butterflies open up more under pressure?? would there be a lack of fuel?
if i were to go out and put a turbo in the car and direct it thru my stock nikki.. what would happen?
would it start? would the butterflies open up more under pressure?? would there be a lack of fuel?
02-28-03, 05:58 PM
#28
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well youd run out of fuel i would assume. im sure youd have to tune it for more fuel and run a rising rate fuel pressure reg.
also have to lock the dizzy and make sure your ignition is up to par, other than that low boost shouldnt be hard at all
also have to lock the dizzy and make sure your ignition is up to par, other than that low boost shouldnt be hard at all
02-28-03, 06:37 PM
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Originally posted by Paul Fitzwarryne
Turbo 12a- are you talking about a 12at which you have converted from efi to carb, if so have you fitted a Nikki carb and what were the difficulties in installation and how does it perform? Robert says its possibly if you modify the hood, what is your experience with the intake plumbing?
Turbo 12a- are you talking about a 12at which you have converted from efi to carb, if so have you fitted a Nikki carb and what were the difficulties in installation and how does it perform? Robert says its possibly if you modify the hood, what is your experience with the intake plumbing?
The turbo hat comes about 3/4 an inch too high. I dont think I'll be able to close my hood. Also the stock down pipe doesnt match up on the stock exhaust.... Intake plumbing is very easy. For the air filter, I went to home depot and bought a 2" to 3" converter (used for high heat plumbing). You need this becuase you have a 2" output on the turbo and a 3" air filter. Unless you can find a 2" filter (I couldnt). Is anybody going to answer my question about the choke??
02-28-03, 06:47 PM
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Originally posted by djmickyg
everyone is saying how hard it is, but no one is saying the problem with it..
if i were to go out and put a turbo in the car and direct it thru my stock nikki.. what would happen?
would it start? would the butterflies open up more under pressure?? would there be a lack of fuel?
everyone is saying how hard it is, but no one is saying the problem with it..
if i were to go out and put a turbo in the car and direct it thru my stock nikki.. what would happen?
would it start? would the butterflies open up more under pressure?? would there be a lack of fuel?
2. Turbo will nto fit under intake manifold
3. You would run out of fuel (need pump and RRFPR)
4. I doubt the butterflies would open up.
Ok too much to list.....
I'm not an idiot, but how the hell do I hook up my Mallory 4309? Why is there 4 holes? Do I need to plug up 2? Are the 4 holes meant for a dual carb?
02-28-03, 07:12 PM
#31
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you have your main feed, and fuel return or something? it's weird. i suck. all this talk about carb probs is making me almost purely want to use the mega squirt efi setup. i have been planning on going turbo with my 12a and have been talking extensively to robert at rotary shack about it and he says to stay with the carb, but ummm, have any of you read up on this megasquirt? i've talked to the guy that has one on his 12a fB and it's freakin awesome. it's set up to handle BOOST TOO! WOOT! i think that's the route i'm goin!
-zac
p.s. it's CHEAP!
-zac
p.s. it's CHEAP!
02-28-03, 07:30 PM
#32
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I agree with djmickya, lots of comment that adding a turbo to a modified Nikki is difficult but few details as to why. One problem is lack of height as it fouls the hood.
What I do know is that three seperate companies in the UK produced turbo versions and none could find a way with the Nikki. The Elford went SU for 160hp, TWR went Weber 45 DCOE for 185hp, and Motorspeed with the Weber for a clained 200hp at the flywheel. I tried the Motorspeed and Elford, their handling was poor possibly because of street tire limitations. The power may seem lowly by modern standards but full race NA RX-7s were not producing much more. In the case of turbos we still had not solved air charge temperature gains at highboost so 5-6psi was maximum.
With all the knowledge gained on turbocharging in recent years, they should have been developments to turbo the 12a Nikki so the average owner can relatively cheaply get to 200hp without porting and rebuilding.
What I do know is that three seperate companies in the UK produced turbo versions and none could find a way with the Nikki. The Elford went SU for 160hp, TWR went Weber 45 DCOE for 185hp, and Motorspeed with the Weber for a clained 200hp at the flywheel. I tried the Motorspeed and Elford, their handling was poor possibly because of street tire limitations. The power may seem lowly by modern standards but full race NA RX-7s were not producing much more. In the case of turbos we still had not solved air charge temperature gains at highboost so 5-6psi was maximum.
With all the knowledge gained on turbocharging in recent years, they should have been developments to turbo the 12a Nikki so the average owner can relatively cheaply get to 200hp without porting and rebuilding.
Last edited by PaulFitzwarryne; 02-28-03 at 07:43 PM.
02-28-03, 09:19 PM
#33
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Originally posted by Turbo12A
I'm not an idiot, but how the hell do I hook up my Mallory 4309? Why is there 4 holes? Do I need to plug up 2? Are the 4 holes meant for a dual carb?
I'm not an idiot, but how the hell do I hook up my Mallory 4309? Why is there 4 holes? Do I need to plug up 2? Are the 4 holes meant for a dual carb?
now about that JBweld nonsense....
02-28-03, 10:32 PM
#34
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Originally posted by mar3
Great choice! If I'm not mistaken, the hole in the bottom is the inlet, the four holes surrounding the body are the outlets...there might be one slightly smaller than the rest, that would be the bypass outlet back to the fuel tank. A tiny little tube sticking out near the top is the pressure or vacuum port so it can reference against a boost source if necessary....glad to see ya ain't a cheapo! now about that JBweld nonsense....
Great choice! If I'm not mistaken, the hole in the bottom is the inlet, the four holes surrounding the body are the outlets...there might be one slightly smaller than the rest, that would be the bypass outlet back to the fuel tank. A tiny little tube sticking out near the top is the pressure or vacuum port so it can reference against a boost source if necessary....glad to see ya ain't a cheapo!
now about that JBweld nonsense....
you are very close Mar3..
the bottom is the return to the tank and the 4 other fittings are fuel inlets.... and yes he small fitting is for boost refrence!
the nikki will work for turbo-charging applications but Webe carbs are much better for blow-through systems.....
dont get me wrong, the nikki will work good but its very touchy when it comes to tuning!!!
i had a NIKKI on my 12A turbo bridge, the only thing stock was the carb body!!
03-01-03, 02:47 AM
#35
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robert,
this is zac. just wonderin how long you think it'll take for the ignitor to get here? hahahaha, i'm so itchy to get my car back on the road WOOHOOOOOO!!!!!!!!!!!!
-zac
this is zac. just wonderin how long you think it'll take for the ignitor to get here? hahahaha, i'm so itchy to get my car back on the road WOOHOOOOOO!!!!!!!!!!!!
-zac
03-01-03, 02:35 PM
#36
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Originally posted by 680RWHP12A
the bottom is the return to the tank and the 4 other fittings are fuel inlets.... and yes he small fitting is for boost refrence!
the bottom is the return to the tank and the 4 other fittings are fuel inlets.... and yes he small fitting is for boost refrence!
) are you seriously trying to say the 4 side ports are inlets?? As in, you need 4 feeds from the gas tank? I'm pretty sure the bottom hole is the fuel inlet and the side ports are outlets to the carb and gas tank....don't make me start digging through the P/S Firebird to pull the Mallory's and their "blown apart" illustrations...
03-01-03, 07:18 PM
#37
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Originally posted by mar3
sigh...He's asking about the Nikki for a reason, not to hear about other options....he knows there's other options, he's been around the block a few times, some of it racing....basically, no one on this Forum knows the answer, that's what it comes down to....where the heck is the psychopathic J-I-B when you need a good Nikki answer??
sigh...He's asking about the Nikki for a reason, not to hear about other options....he knows there's other options, he's been around the block a few times, some of it racing....basically, no one on this Forum knows the answer, that's what it comes down to....where the heck is the psychopathic J-I-B when you need a good Nikki answer??
BOING!!!!
Yaws modded street Nikki flows about 415-425 CFM @ atmospheric pressure!!!
You can boost the snot out of a couple of SUs and get outrageous power. (Drivability I would'nt think, though.
)So all you "Get a Holley, man!" girls can line up and lick the backsides of all the "Get EFI, man!" girls.
The man clearly stated he wanted to know about the
NIKKI CARB!
03-01-03, 07:18 PM
#38
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all the side inlets are fuel feed lines ....from the tank ,to the carb, to a fuel guage, whatever you want to use the inlets for...the hole on bottom has a sticker that reads BYPASS,,, to the tank
FB2.... you igniter is on its way!
FB2.... you igniter is on its way!
04-01-03, 03:56 PM
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So, if I were to seal the stock air lid, or some kind of hat like that, and then put a second gen turbo on it, and then a Mallory 4309 with a good pump, will it boost, or is there somthing that needs to be modified in the carb?
Please tell exactly what you need for a stock port and no more than 8 PSI.......... carb HAT, bonnet, what ever.... just on top, not completly coverin the carb.....
So the fuel system to the carb is covered, and the pressure to the carb.....
how will the cab react? normally?
Would I have to rejet it?
What else?
Please tell exactly what you need for a stock port and no more than 8 PSI.......... carb HAT, bonnet, what ever.... just on top, not completly coverin the carb.....
So the fuel system to the carb is covered, and the pressure to the carb.....
how will the cab react? normally?
Would I have to rejet it?
What else?
