will i hit 200?

[s2000b4idie]

i have a 4g63 n/t. It was recently completely rebuilt and has yet to be even started. ( this weekend i hope) the head and intake were slightly ported. i have a injen CAI, bosch platinum 2 plugs, pace setter header( i know junk but oh well), balance shaft removed, exhaust cam advanced, and i run synthetic oil if it makes a difference. now what ti want to know is if i get small around 25 hp shot of nitrous will i be able to break 200 hp????


thanks
sam

 

[Ralli///Art GS]

basically all you've done for performance other than basic bolt on's is a slight porting and removed the balance shaft, so figure +10hp from that. why would you waste your time on a 25 shot, put in a 65 or 70 and tune the EGT and A/F right. Then you might see 200hp. Otherwise it's basically stock 130 hp or whatever, just a fresh engine.

 

[s2000b4idie]

wont a bigger shot destroy my motor?? i heard that any thing over50 would demolish it ??? if i can id like to go bigger ill ask the shop that rebuilt it whatt hey say its got all new bottom end and 10.5:1 compression pistons somabey it will stand the larger shot ill look into it

 

[orionfreak]

Here is my opinion on the Bosch plugs. THEY ARE JUNK Get RID OF THEM. I had them in my completely stock 98 n/t eclipse I ran them for about 1,000 miles until my car started to miss hessitate when I would pull out from a stop and sometimes I had trouble starting the car. I took them out and the electrode was melted down into the porcelein. I replaced them with some ngk plugs and haven't had a problem since I haven't changed the plugs for 2 years I have close to 20,000 miles on the plugs. Who knows I just might of gotten some bad plugs or something. That's just my 2 cents. I'm sure other people have other opinions about them but that is mine.

 

[Ralli///Art GS]

I agree that bosch plugs are shit, use NGK. I run a 65-70hp shot on my stock motor with 170,000 miles, so I think you might be able to handle it...10.5:1 is much higher compression, you didn't mention that. I think if you had some cams coupled with that compression and a well tuned nitrous setup you could break 200hp. The secret to nitrous is to get the fuel tuned right, and use it in appropriate ammounts (i.e. don't spray for 45 seconds..)

 

[jadamc]

Originally posted by s2000b4idie
wont a bigger shot destroy my motor?? i heard that any thing over50 would demolish it ??? if i can id like to go bigger ill ask the shop that rebuilt it whatt hey say its got all new bottom end and 10.5:1 compression pistons somabey it will stand the larger shot ill look into it

You should be able to run a 100shot with minor fuel upgrades. Your car uses a little higher compression than the 4g63T, but it uses the same big rods so it'll handle a little bit more than most non-turbo engines in it's class.

 

[s2000b4idie]

thanks for the info guys did some research and called the shop that rebuilt it they went with the eagel rods so bottom end is sound. im gonna upgrade the fuel system and run a 75 shot with the higher compression and cams it aughta be niiice


thanks

sam

 

[Ralli///Art GS]

You shouldn't need much if you are going to run a dry system. Just upgrade the fuel pump to a turbo pump or something aftermarket, get an EGT gauge so you can monitor your exhaust temps. The stock injectors should be up to the task of a 75 shot. An a/f gauge gets an inaccurate reading when you use nitrous because of the added O2 content in the exhaust. A datalogger setup would be a good idea so you can see you injector duty cycle and other engine vitals. So basically I would upgrade the fuel pump, do the fuel pump rewire, and get a few instruments so you know what your motor is doing.

 

[miamieclipse]

what about running a wet 50, no more than a wet 75? I would check the compression 1st to make sure everythin is running good, get an afc-II & a fuel pump (figuring that upgraded injectors would flood the engine @ idle.) Intake, header, exhuast, no cat...what else would be needed to run safely?

 

[Ralli///Art GS]

If it's a wet system you wouldn't need to upgrade the injectors. Just make sure you have a decent fuel pump to provide adequate fuel pressure. Then there is no tuning to do to get your fuel trims right.

 

[s2000b4idie]

rockin

 

[miamieclipse]

so what would the point of getting a afc? wit a 75 wet shot i would need an upgraded fuel pump, but ure saying there is no tuning makin the afc obsolite (sp?)

 

[Ralli///Art GS]

I don't know where the whole idea of the AFC came in. Regardless of what type of nitrous system you have (dry or wet), you make tuning adjustments through fuel pressure and through jetting. On dry systems like mine, there is a "T" fitting spliced in the vacume lines by the FPR with a jet in it, adjusting that jet will adjust the fuel mixture. With a wet system you change the fuel jet in the fogger nozzle. The only time I could see using an AFC on a setup like that being discussed is when you have to adjust for different sized injectors. The only time I could see putting different sized injectors on is when your duty cycle gets up to 80-90% as the injector spray pattern tends to deterierate and that will cause a dangerous situation in your motor, especially with nitrous being involved. With a wet system this is even less of an issue, since the added fuel for the nitrous comes from the nozzle, as opposed to a dry system where the extra fuel is supplied by the injectors. Either way adequate fuel pressure is a must, hence the larger pump. With a turbo car it makes sense to go with a wet system since the injectors have their work cut out for them because of the boost. An AFC shouldn't be needed to tune a nitrous system, just a few gauges and a pocketlogger.

 

[ivanr4g63]

All the information here is great, but if you're getting a Nitrous shot bigger then 50hp, you should consider retarding the timing a few degrees back... just to make sure you wont hit detonation, this is very important since you mentioned you have played with your camgears...

Also if you have 10.5:1 comp ratio, dont get a bigger shot than 75, unless you have high performance head gasket and piston rings (wich you should have).

My advice is: get a nitrous kit with a set of jets going from 35/50/75 (around 15 bucks for a set of jets) and start playing with a 35 shot, and go from there carefully monitoring the engine, you'll be fine even with the 75, but is always good to start safe.

 

[Ralli///Art GS]

Well said Ivan. I started with a 35 shot thinking that would be enough, but aparently there's never enough...

 

[Colossus]

s2000...check the nitrous forum bud.