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Tuning a 2ltr 8v sri 115bhp...

2K views 39 replies 14 participants last post by  carman 
#1 · (Edited)
Car - MK2 nova
Engine - Cav 2ltr 8v sri MPI 115bhp, F16WR gear box.
Mods to engine - Head ported and polished, Valve seats re-ground, 4-2-1 manifold and down pipe, full SS straight through system, no cat.
K&N induction kit.

Im looking to get my ECU mapped and car rolling roaded, pressent from parents for 21st, so got bout £100 to spend.

What else should i do, nothing like Twin 40's.

Neil
 
#4 ·
the problem of high lift/duration camshaft is the fuel injection. If your fuel injection uses air flow meter, you will have a really bad idle, don't will work good. I try it in my C20NE when was N/A, and its don't work good.
Is better if you put bigger valves, vernier pulley(work the cam litle retarded), and work or change the TB for bigger one.
Good chip remaped, with agressive ignition advance and litle more richer mixture, will add some horsepowers too.


Cheers!
 
#8 · (Edited)
Not much point changing them it wont do anything. If its from an sri its a 130 not 115.

Cam will be good it just depends on what one you want mild or high. The higher you go the more the idle will suffer as the ecu doesnt know how to fuel it properly.

You'll need more than a 100 squid if you want more gains.
 
#9 ·
I know a bloke on ebay that sells super chips by themselves

I bought one off him and noticed a slight improvement, chip only cost me £40

he also supplied the eeprom holder os if the chip didnt work I could easily swap the chips back again and get a refund

pm if u want more info
 
#10 ·
get a CR box aswell this will help acceleration.

if it is the 115 bhp model its not that hard to retro fit a samll turbo application to it

rodgerq
 
#13 ·
well i had a CR box on and took it to gear box specialist and asked for a CR box and they fitted WR, so annoyed but at least my car moves so im not bothered with it as my car is running, as ive had so many problems with it.
 
#15 ·
cam on it's own odders ain't gonna give the extra 15 bhp, need sthe pistons changed to the seh ones as they have a smaller dish to up the CR. also need the ecu too. different map.

with everything else you've done it should if the engine is in good nick bring power up to around the 145 mark

btw the 2.0 heads are the same wether or not they are fitted to the seh or ne
 
#16 ·
to turbo you'd need a smallish turbo unit, a t3 would be more than ample. then you'd need to get it mounted on the exhasut manifold. this can be done by buying a new turbo manifold suited to your head and turbo or making up an adaptor from the cast manifold to take the turbo. then oil and water feeds and exit, not much hassle there. boost pipes and a decent intercooler, rising rate fuel pressure regulator and basically thats it apart from tidying things up for neatness, maybe a set of 16v injectors would be a good idea aswell. i've seen it done with good results, low boost obviously. if you watd to up the boost a bit you could always use 2 headgaskets.

rodgerq
 
#18 ·
rodgerq said:
to turbo you'd need a smallish turbo unit, a t3 would be more than ample. then you'd need to get it mounted on the exhasut manifold. this can be done by buying a new turbo manifold suited to your head and turbo or making up an adaptor from the cast manifold to take the turbo. then oil and water feeds and exit, not much hassle there. boost pipes and a decent intercooler, rising rate fuel pressure regulator and basically thats it apart from tidying things up for neatness, maybe a set of 16v injectors would be a good idea aswell. i've seen it done with good results, low boost obviously. if you watd to up the boost a bit you could always use 2 headgaskets.

rodgerq

How much would this cost and can u fit a dump valve :D ?
 
#22 ·
rodgerq said:
get a CR box aswell this will help acceleration.

if it is the 115 bhp model its not that hard to retro fit a samll turbo application to it

rodgerq
What's involved in that? soudns interesting, i thoguht it would be hard and expensive to add a turbo?

heres info on the seh engine if it helps atall:

What made the SRi 130 quicker than a standard SRi?



· 2 Bhp more than Astra GTE 2.0L due to better exhaust route

· Revised Bosch Motronic Engine Management

· Larger Intake valves & exhaust manifold

· More compact combustion chamber shape

· Bigger bore exhaust along the length

· Shorter, lighter Pistons

· Revised valve timing

· Integrated, adaptive engine management & ignition system

· Engine block both stiffer & lighter

· Crank & con rods lightened

· Friction loss cut by thinner piston rings & valve stems

· New high efficiency oil pump & cooler in front grille.

· Smaller water jacket for quicker warm up & enhanced pump.

Standard: 130Bhp @ 5600 &133lb ft @ 4600 rpm 0-60 circa 8s
 
#24 · (Edited)
thought it would be hard to turbo the engine aswell with all the talk of proper engine management low comp pistons etc etc (and to be fair this would be the best way of doin it in terms of reliability), but then i saw it done twice on two seperate engines(the cheaper way as i have described above) and its not that much work!! as cost effective option the standard ecu can cope with small amounts of boost and if you follow the basic principles then you should have no problems with it.

and yes, you can fit the all important DV. :D

rodgerq
 
#25 ·
rodgerq said:
thought it would be hard to turbo the engine aswell with all the talk of proper engine management low comp pistons etc etc (and to be fair this would be the best way of doin it in terms of reliability), but then i saw it done twice on two seperate engines(the cheaper way as i have described above) and its not that much work!! as cost effective option the standard ecu can cope with small amounts of boost and if you follow the basic principles then you should have no problems with it.

and yes, you can fit the all important DV. :D

rodgerq
I agree with Roger. But i prefer use a bigger turbo compressio, because its will keep the healthy of engine in high revs, and will make more power. The price of it, you will have more lag. With .42/.63 turbine, the boost will begin come at 3.000rpm, and with 0.50/.63(my actual turbo), the boost only comes at 4.000 to 4.500rpm..but the power when comes, is EXPLOSIVE.

O lost my last engine bay picture, i will post here a old one, and when i catch the digicam, i will take a new picture of my engine bay with the .50/.63 turbo:

if don´show the image, copy this link in your navigator:
http://www.geocities.com/crivile/gsienginenew3.jpg



the result of it? well.. i running with alcohol here, alcohol make more power, because you can running in high CR without detonation, but with 1 bar(or 15 psi that you prefer ..) i beat a BMW M3 like a S.Stallone beat in L.DiCaprio.

Put turbo in your C20NE, and you don´t will be disapointed..


cheers!
 
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