I'm pretty sure there will be no problems with this, but I figured I should ask anyway. I have a 90 N/A and very soon I will be putting two stock 88 T2 secondary injectors in place of my stock n/a secondary injectors. Will I run into any problems with the swap from s4 to s5? It is true that the T2 injectors were of higher flow than n/a's right? Nevermind, I already know the answer to that last question. When upping the secondaries I will only get more fuel at higher rpms right? On an s5 n/a when do the secondaries generally kick in?



Oh, sorry for the subject change, but my stock 90 GTU shocks and struts will fit on an 88 vert right? Am I correct in thinking that the only differences in shocks and struts on any second gen is whether or not it's eletronically controlled right? My reason for asking; I'm trying to get a white88 vert for my girlfriend and it needs new shocks, struts, springs, some bushings, a diff mount, and a new top. I'm soon to be putting KYBs on my GTU and my suspension isn't very worn so I was just gonna put mine on her vert if it would fit. I make my own delrin bushings and such at work and I can get diff mounts like nothing. Would my plan work in theory?

Thanks in pretence.

 

If i remember correctly you will get problems using s5 t2 injectors. What are you doing to your car? 6port turbo, or just trying to beef up the NA. If you are just beefing up the NA then the stock injectors should be effiecient til about 250hp, which will be a very difficult task to reach.

The reason getting bigger injectors aren't effective is cause the NAs run really RICH and it hurts the top end. I would suggest investing in a standalone or a piggy back, like a safc, and then leaning out the top end a little to gain some of that lost hp. the secondarys kick in about 4k rpm.

 

I'm using s4 t2 injectors in my s5 na. I don't really have the cash flow for an SAFC right now. My plans are Haltech so...... That's future though. Could I put them on my primaries to get some more low end? Right now I'm running leaner than I like. I mean, I can barely smell the "fuel" smell at a drive through liquer store. I drive an rx7 for Christ's sake. I want to be choking people out. I'm running some injector cleaner on my stockies which seems to have helped alot, but I'm still not as comfortable as I would like to be. I know for a fact that leaning them pops them. Plus I like shooting flames

 

This is a really bad idea. You will not gain anything, you will only lose power and waste fuel because of the crazy rich mixtures. Unless you have a bridgeport or crazy streetport, the stock injectors are more than sufficient.

 

and no they aren't a toss in deal, those TII injectors use a different clip which needs to be soldered onto the wiring harness.

 

No! Then you'd be losing power through the whole rev range instead of just the top half, plus you'd probably have starting problems.

Unless you have a wideband, you have no idea what your mixtures really are. Plus I assume you don't drive through liquor stores with the engine under full load, which is the only time where lean mixtures can be dangerous.

Oh geez...

You don't know as much as you think. Running an engine lean at full load is dangerous, but much less so for NA engines than turbo'd ones. NA FC's run conservatively rich mixtures stock, and only highly modded engines get near the limits of the stock fuel system. If your engine truly was running too lean it would only be because something was broken, not because the injectors are too small.

Do yourself a favour and put the right injectors back in. You'll gain power back and reduce fuel consumption.

 

The NA injectors supply MORE fuel than is necessary for an NA as it is. Adding TII injectors will not gain you any power, at all, anywhere. The stock injectors already run rich on the top end anyway. Save the money, dont do this.


NC

 

So, how about that suspension question? Will they fit?

 

And for your question about swapping suspensions...you can't.
Your base model GTU has a different type of suspension versus the convertible.


-Ted

 

Playing around with my SAFC-II, I needed to pull out massive amounts of fuel (IIRC it was >35%) to get to stoich under full load (non-turbo, not worried about detonation).

I've heard rumors of non-turbo ECUs getting air/fuel ratios into the 9:1 range.

They run stupidly rich stock - you don't need to add fuel. If anything, putting in slightly smaller injectors or dropping the fuel pressure would make more power on a NA.

-=Russ=-

 

Thank you very much Syonyk. That was a beautiful answer.

And I DO thank those of you above that gave me answers. I apologize for my horrible anger management skills, but I'm not a fan of being pounded and labeled an idiot for asking a question that I was wondering about. You know? It's like, "Excuse me for asking for an answer to a question I'm not sure about."

 

Ok I know this guy how knows his ****, and says the n/a primarys run only slightly rich, but the secondary's run lean. He proved this by a test he did. The stock fuel pressure is regulated to 32 psi (i believe), and unregulated is 36 psi...he installed a solenoid valve that, at WOT, would activate the solenoid, and bump up the fuel pressure to 36. He said you could really feel the car suddenly pull ahead.

Note: I did not witness this test so i'm going on his word, but like i'm telling you, this guy knows his stuff.

P.S. I'm not sure if those are the EXACT numbers, but its the idea.

 

Any way I could get a name or thread? So you are saying in a nutshell is, keep the n/a injectors and up the pressure on them a little? hmm..........

I think I'm just going leave it alone and get an RTek chip to lose that damn OMP, then go Haltech after I get some money in the pocket.

 

Wideband O2 scans have proven his "testing" wrong.

They dont run lean stock.


BC

 

arent S4 injectors low impedence and S5 injectors high impedence? how can you be using S4 injectors in an S5 without pissing something off?

 

[QUOTE=Bama420]Any way I could get a name or thread? So you are saying in a nutshell is, keep the n/a injectors and up the pressure on them a little? hmm..........

QUOTE]

His name is Fred (never caught his last name), and he's not on the forums. If you've heard of JHB performace in Winnipeg, he does the porting and rebuilds for them.

I was just telling you what HE says, not what I say.

 

His name is Fred (never caught his last name), and he's not on the forums. If you've heard of JHB performace in Winnipeg, he does the porting and rebuilds for them. Oh yeah, and he was head Rotary mechanic at Gerry Gordons Mazda for like 15 years or something.

I was just telling you what HE says, not what I say.

 

Put a wideband on that car and come back and tell us it's running lean. That won't happen for a very good reason.

Too much fuel and it'll bogg down. Buy a SAFC and lean it out so it'll run better.

 

You first post said "very soon I will be putting two stock 88 T2 secondary injectors in place of my stock N/A secondary injectors", but your second post said "I'm using S4 T2 injectors in my S5 NA". Now that you've found out it's a dumb thing to do you're saying "It was an idea". So which is it? We don't even know if you're telling us the truth.

This guy doesn't know ****, not about FC's anyway. The injectors don't run rich or lean, they just inject fuel. When the secondaries are online all four injectors fire with the same pulsewidth, i.e. they contribute equally to the total amount of fuel injected. Static fuel pressure is not 32psi (unless something's wrong), its 36psi, and that's what you'll get any time you’re at WOT. Fuel pressure is controlled by the FPR to maintain a constant pressure differential with the manifold, so at high vacuum (i.e. low throttle) the fuel pressure is reduced and at low vacuum (i.e. full throttle) the fuel pressure is increased to its maximum. There is already a solenoid installed in the FPR vac line, which can cut the vac so fuel pressure is increased to the full 36psi to assist with hot starts. Assuming this is the solenoid you're actually referring to, doing this will have zero effect on full-load mixtures because at WOT the fuel pressure is already as high as the stock FPR will allow.

No, you need to ignore that crap and listen to all the people who've already told you that NA's run very rich. Increasing the fuel pressure would only make things worse.

 

spend the money on an SAFC and lean that bitch out a little up top.


Use a dyno with a wideband to do it


BC

 

in 88 they started using high impedence injectors in all series so they are swappable without any real hassle with resistors but the injector plugs are different between S4 and S5 injectors. anything prior to 87.5 has low impedence injectors.

 

I can't believe I didn't see this also only after NZConvertible's reply... :P

DUDE...the stock system already does this, so if you're getting this sudden surge of power, something is really fucked up.
The stock FPR is supposed to hit 36psi at WOT without any help, so something was already wrong to begin with.


-Ted

 

that or his newb mechanic was just charging for a stock FPR that he claims he "rewired".


my best advice for the OP is to stop hanging around with honduh mechanics, seriously..

 

So what is a Wideband o2 sensor (as compared to stock), and do you need a standalone (or safc) to use it?

 

http://www.zeitronix.com/

http://wbo2.com/

And buy a SAFC to lean it out.

Personally the cheapest way I found to make a n/a go faster was by doing something similar to this thread http://forum.teamfc3s.org/showthread.php?t=106

That said, I've a 86 na and I like driving it as a stock n/a. It's a different driving experience than driving my turbo cars and I enjoy it. I think because I can work(drive harder) the car more than I'm allowed to with the tubo cars. Can't explain it better than that.