im planning on doing all this from stock, but the mods im doing are as follows:

direct fire ignition with TT + 2nd gen leading
new exhaust (RB headers, plus whatever else i find suiting)
rebuilt carb stripped of emissions
ported intake mani
and rats nest removal to simplify everything.

my question is this. what kind of power gain can i expect from doing all this? i was hoping for maybe 30hp but im not sure if that would be unreal.

and if needed, i would also upgrade the fuel system.

thanks for any input.

 

The only power increase mod you have listed is the exhaust.

 

I hate to disagree with you Doc, but the TT ignition setup yields great results. This is one of the mods that I would recommend doing first, just because of the improved driveability, gas mileage increase, and more power all over but especially at higher rpms.

 

you wont need to upgrade your fuel system for what you have listed...

 

No need to upgrade the fuel system unless you are talking about going with an aftermarket carb and intake. Looks like a good start.

 

Sorry, Define abbrev TT?

 

17HP

just a guess.........

The Racing Beat exhaust system is good for about 10-15. With the carb rebuild, it should actually help alot. Most of our carbs are waaaaayyyy overdue for a rebuild. The upgrade in ignition, although is not a direct HP gain, will help achieve the best gains from other upgrades. There is no need to port the intake, unless a engine port is in your future.

 

Sorry Doc. TT stands for Transitor Trick. This is the unit designed by glsseaddict and allows the 1st gen ignitor to trigger the 2nd gen ignitor. The 2nd gen ignitor produces a much hotter spark from the 2nd gen coil than you will get with the standard 2nd gen direct fire mod.

I've tried stock, standard 2nd gen direct fire, and the TT mod. There is no comparison between them at all. I am a firm believer that there is all kinds of power tied up in the ignition system, based only on my own testing and results.

 

Thanks Kentetsu. I've heard good things about that mod.
In obtaining a better spark thru out the RPM range will make better usage of the available HP. Therefore making it sustain that HP for a longer period. (peak hp)
As far as what HP "Increase" the mod makes, I would have to see dyno's on before and after.

 

Well, scratch ported intake mani off that list cause its not going to do you any good with the stock carb. It would be a waste of time IMO. Everything else is good though. Probably good for about 15-20hp, but I wouldn't say any more that that. Definately not 30hp though.

 

It used to be with the RB header "System", meaning their presilencer and muffler that the gain was appprox 25HP. Has this changed?

 

The biggest bottleneck for power that you currently have is exhaust. Once the new exhaust is on, then that bottleneck will move to carburation.

However, once you look into upgrading the carb (I like Sterling myself) you will also need to upgrade the fuel system to accomodate the new carb. A lot of this stuff is all tied together, so even though a certain mod might give X amount of power, you will only see that gain if all the other required pieces are in place...

The stock fuel pump and filter setup is just barely adequate for a stock car. So even if you upgrade those items first, you might not see any gain but the groundwork will be in place for all future mods, thus giving you the full benefits of each mod as you install them. Make sense?

 

makes oerfect sense to me. the only reason i mentioned porting the intake mani was to allow for better airflow. i figured it would help out econ. wise, but maybe my logic is a little out of wack. i do realize exhaust is the only real power producer on the list, but i figured cleaning everything up would work in synergy with the power gained.

how much are the sterling carbs running nowadays? i have a spare 79' carby lieing around, which is the one im planning on rebuilding, but if i can get a new, or even used sterling i would definately go that route.

 

what year rx7 is this happening too?
when you rebuild your nikki, you could also grose jet it... might help with the fuel delivery for that header set up... i went aftermarket (twin weber down drafts) and saw a tremendous gain in power... one of the best mods i did was a black magic electric fan....

 

Just going with a header and free flowing exhaust along with a better flowing air cleaner (racing beat) felt like a big difference on my old 12a stockport.

 

You need a new fuel pump when you get a aftermarket carb (weber 45?)

 

^^ if that was a question, then most people would say yes. the stock fuel system has just enough umph to handle a stock setup. but once u add on a higher performance carb, its going to need more fuel delivered to it.

the car is an 80'. Red.

as of right now i have a spare carb, and the ignition setup (just not installed yet. ran into a problem with the tach that i havent figuered out yet.)

i couldnt find a rebuild kit at autozone.... they said that they cant get them. which made no sense to me, but NAPA had one. it was like $50 and didnt include the floats.

 

Is this the trick you're talking about? Guess what, I searched!

https://www.rx7club.com/1st-generation-specific-1979-1985-18/transistor-trick-2gcdfis-411312/

Is there a DIY for it or is this the only one?

https://www.rx7club.com/1st-gen-archive-71/ignition-i-have-question-about-dlidfis-531144/

 

That's it alright! He's still working out the final bugs, and the new version should include lots of new options, but still at a very reasonable price. He just got back from France, and is just about ready to get back to work on it from what I understand.

In the mean time, the current version still works great, but will burn up the 2nd gen ignitor every so often. This is what I am currently using...

 

i just want to get mine hooked up. my tach is connected to the stock leading ignition, so if i remove it, then no more tach. i havent figured how to bypass that yet, but i guess i <i> could</i> try a little harder.. haha