I have that book and I did not get that. Where does it state that. All forced induction is NOT the realm of EFI. Again I'll quote Tom Burch (Multiple record holder at Bonneville) "While the others are tweeking their computers, I'm setting records".
There is no doubt that EFI is best for forced induction however that is with a lot of development by professionals. The point being that is way beyond the typical DIY mechanic. Again I like the Lampredi approach on the Volumex
1) Simple with only a carb, supercharger and manifold. No electronics.
2) The suck through carb/ supercharger design requires no intercooler as the fuel cools down the charge as it is being compressed.
A turbo runs hotter due to small wheel compressing the same volume in a smaller space, ie a intercooler is required even on low pressue (5psi) applications. (I also have a 900 SAAB Turbo)
3) A simple change to a 45 DCOE on the Volumex results (per Guy Croft) in 160hp still running low 6 1/2 psi system. That is quite a lot for a street engine. More is available by increasing pressure with a pulley change.
Ciao
WAyne
Blow Through Carb
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wmausbach
- Posts: 77
- Joined: Fri Jun 27, 2008 11:04 pm
- Your car is a: fiat 124 spider
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Zmatt
Re: Blow Through Carb
The EFI bit is personal opinion. the book didn't state that. I just think EFI does a better job of managing the mixture and can get better, more consistent results. I also don't think Bonneville has much to do with streetable engines. I've read about some crazy things done there, like 1.5L engines with 40psi pushing Mk2 mr2s to 200mph. I don't think anyone in their right mind would build such a street engine.
I don't see why someone with a Gt25-28, efi and an IC couldn't get 200hp+ with these engines easily. that's a number that seems to be in the higher end for what people have done with street tuned versions. If I remember correctly the engine Guy croft did for Top Gear was somewhere around 200bhp and there is no telling how much money was in it.
I've considered the matter of Carb'ed forced induction before and although it may be easier to set up, in the long run is it the best? Many people have emissions requirements to worry about (I don't in KY we don't emissions test), and not to mention the higher maintenance involved. Maserati got a bad rep in America because the biturbo never wanted to run. Granted, it was a twin turbo carb V6, I think the same issues apply. If its a track car or something that you drive only every so often then it may not be a big deal. But I would have different goals in mind.
I don't see why someone with a Gt25-28, efi and an IC couldn't get 200hp+ with these engines easily. that's a number that seems to be in the higher end for what people have done with street tuned versions. If I remember correctly the engine Guy croft did for Top Gear was somewhere around 200bhp and there is no telling how much money was in it.
I've considered the matter of Carb'ed forced induction before and although it may be easier to set up, in the long run is it the best? Many people have emissions requirements to worry about (I don't in KY we don't emissions test), and not to mention the higher maintenance involved. Maserati got a bad rep in America because the biturbo never wanted to run. Granted, it was a twin turbo carb V6, I think the same issues apply. If its a track car or something that you drive only every so often then it may not be a big deal. But I would have different goals in mind.
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guycroft
Re: Blow Through Carb
Yeah, well, that 200bhp on the Lotus Lada came from J Clarkson without any reference to me and it was a damn stupid thing for him to say because it had nothing like that, more like 145-150 -ish. And quite right too as it was by no means highly tuned I might add: that was my brief.
What it did have however was a whopping torque curve which made it feel a lot more powerful than it really was (in net bhp terms), I mean it could give 3rd gear wheelspin. You need a lot of torque to do that under acceleration.
G
What it did have however was a whopping torque curve which made it feel a lot more powerful than it really was (in net bhp terms), I mean it could give 3rd gear wheelspin. You need a lot of torque to do that under acceleration.
G
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fiatfactory
- Posts: 506
- Joined: Sun Jun 13, 2010 11:22 pm
- Your car is a: 1970 128
Re: Blow Through Carb
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Last edited by fiatfactory on Tue Jul 02, 2019 1:54 am, edited 1 time in total.
nothing to see here... move along.
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Zmatt
Re: Blow Through Carb
@GC
Thanks for the info, when I saw that episode I was a little skeptical as 200bhp sounded like race spec power for an NA Fiat TC. Still, it sounded great and the car looked good. I wish we had the parts and support in that states that you guys have.
@Steve
that's pretty awesome. what kind of power was it making? Also, how reliable was it? Would a similar, lower boost setup be something you would drive on the street? I'm working off what I have seen and have been told, but any first hand information would be greatly appreciated.
Thanks for the info, when I saw that episode I was a little skeptical as 200bhp sounded like race spec power for an NA Fiat TC. Still, it sounded great and the car looked good. I wish we had the parts and support in that states that you guys have.
@Steve
that's pretty awesome. what kind of power was it making? Also, how reliable was it? Would a similar, lower boost setup be something you would drive on the street? I'm working off what I have seen and have been told, but any first hand information would be greatly appreciated.