Vee

I did the TID mod and install highflow cone filter, took out the cat and air pump, install 3" single exhaust piping with straight through muffler..everything else is stock on the 88turbo2....my question is with these mod..will I damage my engine if I don't chang anything else to compensate for this mod...??like fuel pump, injector, computer..etc..cause at this time no $$$$..new year's coming $$$$$****! why do they have christmas, new years and boxing day!!so close together...???$$$$

Scott 89t2

yes you need more fuel. if you floor it you have a good chance of blowing the engine. (few grand $$ to replace)

put your stock intake / TID back on. buy a bigger fuel pump, and I hope you atleast have a boost gauge??

do you have an FCD?? if not the car will just cut out if you floor it, which isn't good either.

Ryde _Or_Die

Do not push the car at all until you have money. Plain and simple.

Vee

If I change the fuel pump to get more flow..does it mean that I have to change the computer also?..cause I thought the computer control the amount of fuel going into the combustion chamber. or does the stock computer automatically compensate if there's more fuel?? what's the purpose for the flap in the TID unit? doesn't that automatically restrict the amount of air entered if there's not enough fuel??

Jimmy325i

hahahahahaha sorry man, but that was the funniest thing I've heard in a long time....

The flap in the TID unit as you call it is your air flow meter. the only air it restricts is the air passing over it as it swings out of the way. The only thing restricting air entering the engine (with the exception of small plumbing but we won't go there) is the throttle butterfly plates. Your right foot is the only thing preventing that engine from detonating itself right now. The stock turbo system on the 7 doesn't regulate the boost very well. If you provide more flow it'll provide more boost and your fuel system cannot support that yet. Runing the engine lean will cause it to blow.

There are probably hundreds of threads on here that explain what and why you need to modify or replace to safely tweak your motor. Just do some looking and I'm sure you will become enlightend.

Vee

I've just finished rewiring the turbo2 stock fuel pump..I readed somewhere in the forum that the stock turbo2 pump is good enough for close to 300hp..now I'm just trying to get close to 250hp at the flywheel..shouldn't the stock be enough already???..do not want to spend the money if it's not necessary...any info will help..thanks.

Evil Aviator

See this site for mods:
http://fc3s-pro.com/sitemap.html

dr0x

You can find a walbro pump for like 100$. Why cheap out? I wouldnt trust the stock tii pump past stock lol

Evil Aviator

LOL, a Walbro IS cheap. However, it works.

The high-end pumps are brands like Aeromotive, Essex (SX), and Paxton.

scathcart

But much more of a bitch of an install. I can say this, as I run an aeromotive 1200 hp eliminator pump from a sumped stock tank.

What are you running, Evil? Just curious.

dr0x

I meant cheap out and not buy a pump at all. Walbros are decent pumps with good flow. They arent top of the line, but they are tested and proven

Funklord

yeah i have a 3" DP/MP and the TID mod with a cone filter without fuel mods other than the rewired fuel pump. i only redline it in 1st gear. all other gears i dont really go past 4500-5000... actually i go more by my boost gauge. i shift once it starts to climb past 0.5 bar.. which is usually around 4500-5000.

Funklord

yeah i have a 3" DP/MP and the TID mod with a cone filter without fuel mods other than the rewired fuel pump. i only redline it in 1st gear. all other gears i dont really go past 4500-5000... actually i go more by my boost gauge. i shift once it starts to climb past 0.5 bar.. which is usually around 4500-5000. it kinda sucks, but im not going to waste my money on a FCD and S-AFC, im saving for a haltech probbably. maybe microtech, havent decied yet.

Evil Aviator

Yeah, they are more of a bitch of an install, but you usually only use the upper-end pumps like that if you are going to totally re-work your fuel system with braided lines, AN fittings, aftermarket FPR and high-flow filter, etc. They also make a lot of noise.

I have an SX pump, FPR, and filter on the 2Gen, while the 1Gen has a Holley Blue pump and FPR, and an SX filter.

I know, I was just being Evil.

However, I don't know anybody who uses the Walbro because they either use the stock pump, move up to the slightly better Bosch (similar to the Walbro but made better), or go all the way up to the high-end pumps.

scathcart

That's what I did. Sumped the stock tank, Ran 12 AN to the 100 micron prefilter, eliminator pump mounted on isolators (still loud), 10-micron filter, to 10 AN lines leading up to split parallel rails, one y off of each rail to feed each nitrous stage's fuel solenoid, parallel rails join together at an aeromotive pro-series FPR, 6 AN return line.

I am considering adding an ice box on the pump output side, or a fuel cooler on the return side. That pump is able to cycle the tank in under 10 minutes when the tank is FULL, and I worry about much heat it would be adding to the tank.

Any input, Evil? Cooler couldn't hurt I guess, and it's pretty cheap.

FC Drifter

Vee, you at least NEED to get an FCD. thats Fuel Cut Defender. if you dont have it, your askin to blow your **** up. its like 80 bucks from most places. the pump fuel pump would be a good idea too. you cant argue with years of RX-7s blowin up from lack of fuel. with your mods, you either get more fuel or take the mods off. cuz if you dont you WILL blow your engine sky high.

Funklord

"you at least NEED to get an FCD. thats Fuel Cut Defender. if you dont have it, your askin to blow your **** up"

the reason people blow their engines is because they get full intake/exhaust then get an fcd, and no other fuel mods. the only time you should get an FCD is if you have other fuel mods too. still having fuel cut stops me from building too much boost. if i had an FCD with my current setup, i would be much more likely to blow my engine, in fact i probbably would have blown it already.

Evil Aviator

Sorry, I don't really know much about all that drag race stuff. You may want to splice a temp gauge into your fuel line near the rail to see what the temperature is before you bother with the cooler mod. Also note that if the fuel is too cold, it will not atomize well. Some aircraft actually have the fuel line run through an oil cooler to cool the oil and heat the fuel.

Vee

No I'm not cheaping out..just that if it's not necessary for my particular application then why wast money..there's lots of companies out there that are selling products..I'm not dishing companies..in fact we need more of them cause it's hard to find parts for fc..I see lots of regular people in this forums putting bigger injector etc....I ask why??if you are not going over 300hp..I heard that stock 300zxtwinturbo injectors makes 300+ hp and that they even smaller then turbo2 stock injectors in terms of flow...and the turbo2 only make 182hp..lots of room to work with no???when mazda created the rx7..don't they already make enough room for future upgrades??(turbo2)

reason why I choose fc rx7 is because it's cheap to start with and not too complicated to work with to get more power..most of the simple addons we all can do ourself(thanks to people within the community).

I've just finish my body modifications on my turbo2..apart from the front end..the side skirt and the rear end is all custom made by me..and it only cost me aproximately 150$ canadian worth of materials...only thing I have to do is paint it (next year). I'll be taking some picture to post..

Maybe I'm the type of guy that don't just put on stuff just because people do it..I like to know the reason why and for what purpose. So far this forum is very helpful in answering all of my question..Thanks to all and have a great upcoming holiday...now what should I buy myself for christmas..ummmhmm maybe a new front mount intercooler???

Evil Aviator

Very true.

You can't compare fuel injectors like that. The hp made by a given engine will also depend on the brake specific fuel consumption of the engine (rotarys suck), fuel pressure, number of injectors, and duty cycle of the injectors, among other things. Note that the 300ZX has 6 injectors vs. the RX-7 with only 4. I don't think that it takes a genius to figure out that the RX-7 is at a disadvantage with everything else being equal. If you want to copy someone else's engine setup, first make sure that you start with the same engine.

Yes, the TII is pretty close to being maxed-out with its stock injectors, and it WILL run lean on the stock fuel system if intake/exhaust mods allow the turbo to produce more boost and the overboost fuel cut is bypassed with an FCD. No, Mazda didn't make room for future upgrades, as they didn't want their customers screwing with thier cars and blowing up their engines. I don't think that too many auto manufacturers encourage wanna-be mechanics to monkey with their products. Just for fun, type in these S4 TII stats and see what you get on this web site:
http://www.rceng.com/technical.htm#WORKSHEET
182 BHP
4 injectors
.64 BSFC
60% max duty cycle
40 PSIG fuel pressure

Vee

aaahhhhaah I see....I like educated comments..seems that you know what you are talking about Evilness .. I'm kindna new when it comes to automotive technology. That's why I ask questions...I am..patiently listening and.....learning...

STR8 FC

What would be proper fuel upgrades for my car i have 3" turbo back exhaust apexi n1 single,tid,stock turbo, ported wastegate, stock fuel system, stock ignition, stock ecu, haven't put much on yet don't wanna blow the motor its a daily driver wanna run like 10psi with the stock top mount