What is the most BHP a N/A OBDI engine can produce without Forced Induction...

[Rustyman 0]

As title says anyone know what the safest useable BHP that can be had for the N/A route ...

It got me thinking as i was looking at page 82 of latest Redline the R32 there is N/A ... and wondered Ok VR6 OBDI is older has half the Valves but surely something like 300BHP is possible and usable for a Daily ???

But here's the handcuff's i don't want to do a Schrick inlet...... ha ha ha

Skim head

Flow it

Cams

De Cat

Exhaust

Filter

Power Pulleys

ECU remap = 270 BHP ???

and good dose of Nitrous at 50hp jets = 300 BHP ....

Would that little lot require bigger injectors & uprated fuel pump ????

[cabrioman 6]

think 270 is a bit optimistic for a na as stage 0 rotrex are 260 ish .... but if your using NOS then the skys the limit but you will need yo get it mapped with the nos and by someone who knows what they are doin with NOS ....

[Rustyman 0]

NOS would be the final part of the puzzle... so discount it for now....

[cabrioman 6]

well i know stealth got about 220 from a rado but that was with a schrick and cams .... could try a big valve head and big lairy cams .... wot about ITBs ????

[Saunders82 0]

210-215bhp at a guess with that list 270bhp on na would probably cost more than the cost of doing that forced induction.

[Rustyman 0]

ITBs ???? Pardon my thinkness,,,,

[cabrioman 6]

individual throttle bodies ....

[Rustyman 0]

Are they not a bit fiddley to get set up right ???

[VR6_Absy 0]

i got 220 with schrick, 268s etc etc and port polished head but with knackered block and rings so should've got more if it was healthy :-(

[Rustyman 0]

OBDI or OBDII Absy ???

[cabrioman 6]

tbh mate dont know never had anything to do with them but would be good see about them,

[Rustyman 0]

Might look in to these then but if they are £££ then i will go to the prescribed way cams, de cat etc and re map if i can get 200 or 220 then i'm happy as i can make up the short fall with NOS to around 275 - 300BHP ... Cheers TONY

[cabrioman 6]

your looking at ££££ for ITBs mate lol

[Ben Seabrook 4]

I would 230 would be the max possible and that would be cramming every inch out of the engine !! without NOS no chance of more inmo

[zacstrummer 0]

Are you going to do all the mods at the same time? If so how much money are you spending?

Mine has had a stage 1 AmD remap and stuff and runs 196bhp on the rollers. Apart from the extra breaks, it's a super smooth delivery of power and it's my daily driver. I still get a good mpg of 32/33 on normal driving.

[yakuza racer 16]

if your looking for itb's, it's cheap, well here by us

the total setup of itb's on my mk1 cost me £500, and it was well worth the cash, a vr6 on ITB's is the bees!!!!

im doing the same as you, but saving and i know exactly what i want to do.

3.1 bore $400

headwork $300

cams 272/276 $290

Wolf / gotech management $490

gruvenwerks power pulleys $350

BMC CDA - $200

headers - $350

Full wet shot nos kit - $400

so far i got the gruvenwerks power pulley kit, and cams laying in my room, waiting to get a spare head to flow and save and build from there.

[cabrioman 6]

if your looking for itb's' date=' it's cheap, well here by us

the total setup of itb's on my mk1 cost me [b']£500, and it was well worth the cash, a vr6 on ITB's is the bees!!!!

how how how how .... please let us in on how you did this ...... !!!??

[craggsy 91]

Motorbike throttle bodies

[yakuza racer 16]

im going to put this in Rand ( ZAR) and then we convert ( i live in cape town, south africa)

43mm toyota ITB's silvertop -R1000

Fuel rail -R250

290cc injectors R600

intake Rowland Stanton- R1500

Dicktator fuel mangement R2000

fitting (JVS TUNING)- R1200

R6550 ( 596.038 GBP)

these are for the parts new and fitting

i got them second hand and had it fitted for R4500 (409.587 GBP)

my mk1 makes (not sure on bhp) 127kw and 225nM without headwork :-#

i love living in a third world country filled with mk1,mk2 parts, vr parts are hard to come by here by us but mk1 and 2, easy peasy!!!

[cabrioman 6]

hmmmmm i like

[Rsjvr6 1]

I cant afford to go down the shrick route as yet. I was speaking to Vince and he suggested Shimmel 268 or 263 Cams which according to Vince are near enough to what you can get to VGI performance. So cams coupled with exhaust filter and chip should be able to give you atleast 20 bhp if your VR is healthy. 260 BHP is rather optimistic with an NA engine.

[Rustyman 0]

So really compared to most cars out there there isn't that much N/A performance to be had out of VR6's ... However having done much research on the Subject basic improvements like 6 branch , de cat pipe, and exhaust filters and re map does bring it to over 200bhp... I can see only one way to reach the 300bhp mark NOS and looks like a 100bhp shot is easily done on stock internals...SO i believe that's the rute to go...