87WhiteComet

I'm looking at buying a P&P TB ya I could do ti my self but I figure I couldn't do it to the expert quality of a professional specailly with the rigth tools.... I just finished doign all my maintence on my car(just bought it) all I have so far on there is a K&N filter. If I added the TB would I have a problem with fuel cut? I plan on getting the Rtek chip for my ECU when I get my next paycheck but I was wondering if there'd be a problem with the TB. Sorry I searched through several pages and couldn't find the info I was looking for.

gingenhagen

you'll need to open up your exhaust before you start to creep up to fuel cut.

87WhiteComet

That's what I thought but I wasnt positive and didnt want to experiement.

NZConvertible

The gains from the TB will be very small, nowhere near enough to cause problems with boost creep. In fact I hope you're not paying much for this TB because on a basically stock engine it'll do nothing...

87WhiteComet

I'm paying $160 for this P&P'ed one it was done by BDC motorsports. In my opinion this is a good price considering I've seen much more expensive ones than this. If the gains are very small now at least they will be much bigger in the future. Do you think this will improve the throttle response much because I'm not looking for any big power gain just better response.

gingenhagen

if you wanted better throttle response, you should have gotten a CDI box. Which you could have gotten for ~100.

iceblue

The gains from a modified TB like that are not necessarily how much HP but how they make the car react and feel.

Just like porting intakes on any motor it will allow it to come alive a little sooner a little harder wile adding a little bit of power.

The only real downfall to one is the excess work you have to go through when you put it on. Removing the coolant line, resetting idle, resetting TPS, and the now AWS controls from the thermal wax pallet. All this means is your car will react different in the morning and you have a little setup work to be done.

87WhiteComet

Fine by me but I'll also look into CDI box because im a big fan of good throttle response.

RETed

Power gains from "porting" the TB is misleading.

Geez, who charges more than $160???


-Ted

YearsOfDecay

BDC does good work, I've seen a couple of his t-body jobs and they are good quality.

Actually... with the stock system... the ported and polished throttle body may cause some blips when you gun the throttle..

Also.. the second set of secondary butterfly's are removed.. this aids in airflow but causes some cold condition problems with the stock system..

You counter all this by playing with the throttle pump settings and coolant maps in your haltech.. but, you don't have a haltech!!!!!

Basically, the ported and polished T-body is best used on a highly modified car with a stand alone EMS...

It does give better flow and crisper response and, IMO, Is worth what BDC charges for it..

But.. on an otherwise stock car.. it will most likely cause some driveability problems!

What I'm getting at is... if you put that opn your car, and don't like the way the car acts or don't feel as though it's all that it was cracked up to be.. don't blame BDC.. Put your stock one back on and keep the ported t-body until you mod the hell out of your car.. which you will if you keep it long enough!!!

RETed

Do you have dyno sheets showing before and after power gains?


-Ted

87WhiteComet

The secondardy butterfly plates havent been removed so I won't be experiencing those problems and no other mods were done either just ported and polished. And by the way I don't think $160 is too expensive considering I now have a second TB with the work done on it.

YearsOfDecay

UMMMMM yes they have....... in order to port and polish it, BDC removes the upstream set of secondary throttle plates (there are TWO sets of secondary plates)

You can't port the t-body without doing so...

this is a BDC port job that I polished the exterior of... note that the upstream set of secondary throttle plates (the dual throttle system) has been removed so that the holes could be widened and the excess metal on the interior could be removed


TED... HP numbers.. no.. crisper throttle response under the right foot after doing it.. YES.. if there was any HP gain, its very minimal.

87WhiteComet

NVM didnt realize that there was a second set.

NZConvertible

Nobody's questioning the quality of his work, only the effectiveness of the mod.

The problem you describe is caused by the removal of the double throttle sytem (the upstream secondary throttles and their linkage), not the porting itself, and only applies to Turbos due to the completely different damper/actuator they use compared to NA's.

Cold idle problems only occur if you remove the thermowax, and have nothing at all to do with the removal of the double throttle system or the porting.

It is ridiculous to suggest you need a standalone and/or extensive mods to make this mod worthwhile. There's no reason why it can't be done to any car, you just need to weigh up the cost vs. benefit. Removal of the double throttle system can be done easily at home by anyone with basic mechanical knowledge and (on Turbos) will give you most of the possible performance benefits. If you have a suitable grinding tool (not hard to come by) then doing the porting yourself is also not going to challenge anyone used to working on cars. $160 is a lot to spend on a mod known to have relatively minor benefits, particularly when all it'll cost you to do it yourself is a few bucks on sundry items and a bit of your time (a lot less time than it takes to send it away to be done).

It does not cause driveability "problems". If you drive the car in an inappropriate manner, i.e. open the throttle rapidly at low rpm, then you will experience a mild stagger. If you drive the car properly, you won't.

The ignorance and misunderstanding surrounding the TB mod and TB porting is amazing, and this post pretty much covers all of it...

RETed

Gee NZConvertible...woke up on the wrong side of the bed today?


-Ted

NZConvertible

I didn't think that sounded grumpy at all. Just getting the facts out there. Again...

iceblue

Hmm :-/ I noticed "throttle dependant" quit a few light accel driveability flukes with mine.

Warm is is a bit different but the TW is removed. Can flood out evry now and then at idle during warm up. "could be b/c no tps at time"

I have a dyno sheet of one on a turbo somewhere. It showd like a overall ither 5 or 15hp. This was do to the boost coming online earlyer, and not the actual mod it's self. This caused a steeper curve in the run.

87WhiteComet

Thank you for clearing all this up. I'm relatively new to rx-7's so any info would help.