Most powerful NA f4r engine

[Ryanj]

What is the most powerful normally aspirated f4r engine people know of and what mods they are running?

 

[sbridgey]

i think it is 234Bhp ish, and i believe it is currently at BTM or was last time i went there

 

[Dave Hester]

Not sure on n/a

But scoff from rtoc has a turbo-charged f4r engine in his r5 gt turbo, running 610bhp

Utter weapon

 

[Ryanj]

610? it's amazing that sort of power can come from a 2litre, but surely that's barely drivable

 

[Naith]

it varies on peoples bragging rights and various rolling roads. with the right internals 250 is possible. BTM built dougs car to 234 but thats with one or to issues that fred wants to look at, its good for 245/250 he said. TDF have recently built up a 240 cup racer to afaik.

 

[Fred@BTM]

250 is about the limit without going BIG money, ie £5 figures

anything over 200 is mega cash though

 

[Dave Hester]

610? it's amazing that sort of power can come from a 2litre, but surely that's barely drivable

Its a drag car but its fully road legal, runs 10sec 1/4 miles

Type in 'scoff renault 5 gt turbo' into youtube to see some vids of the black beast

 

[Naith]

whats the main limitation fred? or is it an accumulation of factors?

 

[Dblock]

whats the main limitation fred? or is it an accumulation of factors?

money surely?

 

[Naith]

im not arsed about money, thats obvious, im talking about the engine.

 

[SamP]

610? it's amazing that sort of power can come from a 2litre, but surely that's barely drivable

Check the power that proper 4 pot 2 litre turbo's will do. 4G63 has done 2000bhp on methanol. Jokes tbh.

 

[Dan519]

I built this a while back

 

[Fred@BTM]

valve train/head is the main limiting factor, "stock" casting albeit played with won't flow enough

 

[DaveDreads]

If only I wasn't poor. :dapprove:

I'd make you a rich man Danny.

 

[Ryanj]

I built this a while back

What mods were you running on that?

 

[Dan519]

spec list was massive, but the jist of it was high compression, headwork and cams, fine tollerence balancing and throttle bodies with extra long trumpets.

spent days measuring every single clearance imaginable on the bottom end alone

 

[T.Trophy]

When you look at how much NA tuning costs, it almost makes forced induction look like a cheap option

 

[Silent_Scone]

Steve, it is the cheap option.. just not in your case because you're flaming bonkers

 

[Ryanj]

spec list was massive, but the jist of it was high compression, headwork and cams, fine tollerence balancing and throttle bodies with extra long trumpets.

spent days measuring every single clearance imaginable on the bottom end alone

If you don't mind my asking what sort of money was spent?

 

[Jay Payne]

id guess £10k+

 

[Ryanj]

id guess £10k+

What's the burpspeed car running?

 

[aucky]

What's the burpspeed car running?

Nothing currently

 

[Jay Payne]

Lol

had a 90k stock engine in it for 2 seasons, finaly cried enough at Oulton recently

 

[Ryanj]

Lol

had a 90k stock engine in it for 2 seasons, finaly cried enough at Oulton recently

Ahh right yeah I remember seeing the vid of that race, I recall a lot of smoke lol

 

[Silent_Scone]

Stock is the way forward, I'd cry if I had just spent out 6k on a reasonable high comp spec only for it to go bang

It would go like stink granted but I decided against that years ago

 

[Goodj]

I'd guess you'd need to rebuild a 230hp engine ever 50 yards

 

[Fred@BTM]

^na, they're fine, need regular maintenance (oil etc) the gearbox will give up before then engine

 

[Goodj]

the gearbox will give up before then engine

Ha!
That's no different than trying to put 170hp through it

 

[Dan519]

id guess £10k+

was probably approaching that, but I didn't cost it and a lot of other work was done including suspension and gearbox recon

 

[chrispy.clio]

There have been 280bhp F4R n/a engines. Videos on you tube of one. Injectors going directly down the trumpets of the throttle bodies and a set of injectors in the usual place!

 

[Goodj]

with strengthened valve springs, longer conrods, port flowing et al....

What kind of reliable red-line can you get out of an f4r?

 

[Fred@BTM]

There have been 280bhp F4R n/a engines. Videos on you tube of one. Injectors going directly down the trumpets of the throttle bodies and a set of injectors in the usual place!

If its the one i'm thinking of its not 280bhp, try 245 tops

 

[Dan519]

I know of an F7R that's up over 260bhp. Revs to 11k+

got some pics on my other laptop

 

[Dan519]

found it!

 

[Fred@BTM]

that the greek one?

IIRC the maxi rally cars were "up there" with silly power NA

 

[Dan519]

think it was done by x-sport and emerald

 

[Jonny1*2]

Stock is the way forward, I'd cry if I had just spent out 6k on a reasonable high comp spec only for it to go bang

It would go like stink granted but I decided against that years ago

Nah, bullet proof mate

 

[Goodj]

11k redline.... for a Clio?

now we're really talking..... can I keep cruise control with that?

 

[Dan]

wasnt the super 2000 laguna BTCC engines N/A F7Rs??

 

[glenn_adam_doble]

http://www.pistonheads.com/sales/3141552.htm found this on piston heads 269 BHP ?