jayk

To answer your question, there is a drop in boost to 8 psi at around 4500 rpm which is during the transition to the secondary turbo. A healthy boost pattern on a stock car should 10-8-10. However, it doesn't usually feel like much of a hesitation because it happens so quickly. You really need to be watching the boost gauge to notice the drop.

There is another common hesitation at around 3000 rpm that I hear is caused by bad grounds. This is a serious hesitation though and feels almost like the engine dies for a second then kicks back in.

travisorus rex

These should help.

http://cgi.ebay.com/ebaymotors/ws/eB...&category=6755

boostgasm

Hey GST-

you drive a girls' car

that is all

MazdaSpeed93

Wow, good one.

MazdaSpeed93

Yeah, you really can't feel anything, maybe once and awhile if I'm concentrating hard enough lol.

He used to have the 3K rpm hesitation sometimes but I don't think he's had that since we changed the plugs/wires, I could be wrong though. I'm familiar with that because DSM's sometimes have the same problem.

If my video camera hooked up to my computer, I would show you a race and that there is nothing wrong with his car lol. Mine on the other hand has a blown turbo oil seal, needs new plugs/wires, and has 107,000 miles on it .

I have nothing for respect for the rotary engines, but reading this site it seems you guys do nothing but put other cars down that are not rotary and need to get a reality check on some things...

SiKoPaThX

iTrader: (2)

Shut the **** up douche bag. On this board a month and running your mouth already?

GST- What we're saying is, you guys need to hook a boost gauge up to his car and tell us the boost pattern it's making. Then we can help you guys out.

I hope you don't take the rediculous and unhelpful things people say as the general concensus of this forum. Some people just need to grow up a little. I guess that's why we're the Evil Forum.

MazdaSpeed93

Thanks man.

Yeah, he knows he needs a boost gauge but he never has any extra money. We'll probably just go get a cheapo mechanical gauge for him here soon.

And if anybody's wondering why he hasn't posted, he probably won't be around a computer until Sunday.

Nghtstlkr7

something must be wrong with his car.... all due respect to the DSMs.... i know how fast those things can be, but he shouldve been able to beat you given the respective mods lists (if i read them correctly).
do the boost test with a guage and hit us back so we can figure out whats up. sorry for the 'tards on this forum... alot of 7 guys are really cool.

btw... i thought you mentioned all wheel drive in a previous post... are you a GST or GSX?

MazdaSpeed93

I have a GST but we usually do roll-ons, so the wrong wheel drive doesn't affect the race at all . I don't know if you guys missed it, but I spike 20psi, making me much quicker than a stock GST although I only have an air filter with free mods.

Trexthe3rd

No disrespect but how would anyone making a statement like this know anything about the condition of their own car? "a couple of BOV mods"? What exactly would those BOV mods be?

What gear were you in? What was your boost level? What was your boost pattern? What are the plug condition? And last but not least, what is your compression?
You should learn how to answer these questions (in another words, learn about your car) before asking why someone beat you.

And to the DSM owner, not that I doubt you beat your friend, because he obviously do not know what he is talking about when it comes to automotive knowledge, but anyone who doesn't know how to properly modify and control their car's boost level really shouldn't be modifying the car to begin with. On the other hand if this is a car you don't mind throwing away, by all means, have fun and mod away.

MazdaSpeed93

He was talking about my car(the GST) and I already clarified that earlier.


It was usually from a 40 roll, I'm in 2nd and so is he. He has brand new plugs/wires. As for the "not knowing how to modify boost," he is completely stock, he hasn't modified anything boost related or anything in general for that matter. I don't think he's checked his compression.

He's not going to do anything stupid with it. I talk and see him almost everyday. I even work with him. He's not alone in this...

Kevin T. Wyum

Let's make this easy, does your car run low 13's or better in the quarter mile? If not then something is wrong with your friends car. If it does then you have a faster car. It's not terribly complicated.

MazdaSpeed93

I have no idea what it runs, but I highly doubt alot of stock RX-7's run low 13's. Not everybody's a professional race car driver.. And maybe they do, but from what I've read, it doesn't seem like it. You can correct me if I'm wrong.

But that doesn't really matter because it's a roll on. The start is everything for a 1/4 mile run.

I'm just going to have him hook a boost gauge up and see if anything out of the norm.

Marshall

..then why on earth did he buy an FD?

No offense meant, just curious.

MazdaSpeed93

Probably because it was his dream car for one long *** time and after looking forever for one he found one only an hour away. We live in Nebraska so anything turbo is pretty rare LOL.

But he has two cars so if anything goes wrong with it, he can drive that.

Kevin T. Wyum

Actually just about every properly functioning manual 3rd gen should run a mid to low 13 with the right driver with no mods at all. Once you're in gear and going the driver doesn't make any difference other than shifting and weight, which isn't going to be a huge deal in a roll on type of event. So the point is, regardless of his driving skill, if he's not pulling away while in a gear and your car does not run low 13's or better then there is something wrong with his car. As I said this isn't real complicated. A stock RX7 on stock tires doesn't get it's good ET because they're great at launching btw, not like an AWD car. The low 13's are on high 1.8 and 1.9 60' times.

MazdaSpeed93

I would call that a REALLY good 60' for being a stock car. I know this is not complicated, I don't even know why he made this thread.

rotorsownyou7

Noone is putting any cars down other than rotaries, than are cars out there faster than rotaries, we are just trying to figure out why he would be losing to a lightly modded GS-T.

BlueRex

What's the mileage on mazdaspeed93's motor? Could be that there is nothing wrong other then a tired motor losing compression.

MazdaSpeed93

76 or 78,000 miles, but it's been stock all its life. Don't worry guys, we'll get the compression and boost checked soon.

rotorsownyou7

Haha, time for a new motor with that kind of mileage!

BlueRex

Not necessarilly. I'm at 95k on my original motor and had it compression tested ~1,000 miles ago and guess what, pulled some great numbers. And I was savin up for a rebuild...

RX7Wishing

i ran a 13.78 in my FD. Mods at the time were.......tinted windows. engine had 77K

technonovice

Stock in the low 13's? Maybe in that cool arctic air in Minnesota. I'd advise more like the mid to high 13's.

Yeah RX-7's don't launch to well from rest. Wheel hop is awful, but there are mods to correct that. Many AWD cars don't launch so well either. Even the mighty AWD Lambo's. Too much traction keeps the motor from reving into the power band at launch so the 1/4 mi times are deceiving low.

MazdaSpeed93

Alright this is MazdaSpeed, i have been reading through all of this and some of you think i have no idea what i'm doing, in fact i do know. I already know all of the realiablity mods so you dont need to mention that to me, i have been lookin for an RX7 for like 2 years so i have learned quite a few things. I know i need to find out the boost pattern and plan on it soon.

As for the mileage, that may be it, i may have a tired motor but the other 2 owners that had it before me SAID that they took really good care of it and it looks like it has been taken care of very well. I have seen an rx7 with over 113000 miles on the stock motor so not all rotary engines give out at 50-75000 miles.