280rwhp@9lbs of boost, stock turbo,stock ecu
 

ported engine, larger secondary injectors, 3 inch downpipe. 9lbs of boost..walbro255 everything else is stock series 5 equipment.. enjoy


http://www.youtube.com/watch?v=Tzoje...er_profilepage

i tried to raise the boost past 9psi, but it would lean out way out of range. so @ 9psi was the best air fuel ratios.. left it happy at 9lbs..

Awesome #s. What size secondaries are you running?

thats really good!

850cc's

Dayum!

What kind of porting?

streetport, same port as my templates i sell.

I was unaware the stock ecu could run an extend port or larger secondary's. Nice work though!

stock ecu has limitations, but the trick is to take advantages of it's limitations..

I am amazed at this, your making around 100HP over stock, just with upgraded exhaust, fuel, and porting.

I know a little something about this. :D


This really makes me want to get my engines on the dyno.

best part about this is. this amount of hp is enough to keep most of us happy in a street car. not much went into achieving this hp goal. ofcourse some people want more, but the average rx7 enthusiast would be very happy with a simple set-up like this. I drive this rx-7 once in a while (when my kid breaks an engine mount, and drops it off for me to fix it) and i could tell you it's a fast and great car to drive.

wow, i am just curious what rpm are you hitting 280?

i didnt look at the rpm on the screen, but i'll get back to u on that..

How are you combating fuel cut?

Is this the same car you put in the other thread that ran the 13.0 at 104mph?

racing beat fuel cut controller..

yes, this is my kid's rx7. you could follow her build and progress on my shops facebook. search for Arp shop in fb

Odd. My FC when it was a very similar setup stock turbo, stock fuel pump/injectors with an extend port made 220hp but did 13.5 @ 104mph down the 1/4. I thought the mph would be higher for 280hp.

Ito, honestly, i hear you on that point you made about this being enough for the street. as you've shown, it can be done with mostly stock equipment. as usual, great work!

does she have a sense of what's next or are you the driving mind behind the car's development?

Based on HP alone, I did too, but 1/4 mile times and trap speeds also depend greatly on the driver's response time off the line and how well the tires hook up and get the car moving. You can have 1000 HP, but if you sit there spinning your wheels off the line it's going to sap your trap speed & 1/4 time.

^if i recall, she was having issues with the clutch. that sounds like more than enough to cause any performance discrepancies you find in the time and trap speed.

what so odd? on a previous run she did 105.66mph and also had clutch issues,(slipping from second gear on) the clutch slippage will cause a low mph. and your missing the most important factor. this is a rookie driver. this is my kid's 3rd time at the track, and she barely knows how to get the gears in. in-experience plays a huge role in drag racing. so i'll keep updating her progress..

Jason, she needs tons of practice with the current set-up.. considering im dealing with a green drag racer i would say she has potential..

don't forget the weight of the vehicle vs hp also determines E.T./mph

Her 60ft time is excellent. So therefore what I'm getting at is the mph isn't there for 280hp. Obviously there is no traction issues. As for weight and hp I'm comparing 2 very similar setup cars.

seems like you dont have much drag racing experience, when a car is SLIPPING A CLUTCH, the car is basically running still. forward momentum is sacrified and E.T./MPH is effected. it's that simple. this 13.0 run was a no where near perfect run. I addressed that a few times and you still don't get it. According to her 60ft mark she should've ran 12.88 but she didnt, showing some issues with in the run. and as far as weight, i'll get some numbers soon. car should run some where between 12.5 -12.6 i'll keep updating her progress

you want to compare 2 similar cars? she went half a second faster then you while the clutch slipped most of the quarter mile. takes alot more then 220rwhp to do that. a comparison cannot be done until the car has a clean run with no clutch issues. hope this helps..

I did a 2.0 sec 60ft so that explains most of the e/t difference. I doubt the clutch was that bad or it wouldn't have gotten off the line so quick. It should be pulling 110 or so mph.

your not reading correctly, car had clutch issues from second gear on and almost to the finish line. clutch was an issue. and im thinking im wasting my time with you. just hang around and wait for updates.. :beatdeadhorse5:

Knowing Ito we will soon see 300HP with this same setup!!!...nice combo for a first gen

I gave the dyno shop a call, peak hp was @7400 rpm and peak torque was at 5800 rpm's..

Wait this engine is in a first gen? If so that makes me even more doubtful it's got 280hp. Also I don't know of any cars that have a problem with a clutch that only affects certain gears.

clutch should be fixed by tomorrow. and later in the evening out to Island dragway for some more practice runs..

did u not see the youtube dyno link? it's a seies 5 turbo Rx7. what goopy means is, a set-up like this in a first gen rx7 would be a fun toy being a first gen is alot ligther..

Looking forward to see the progression of this car.

I'm not sure what your problem is, from the beggining your insinuating that a stock ecu cannot achieve these goals, then you go on and on. For your information, I have dynoed over 327rwhp with a stock ecu over 10 years ago. and ran 11.7 with that same stock ecu in a series 4 turbo II..

not only did I post a dyno sheet but also posted a dyno video pull. i'm not here to brag but to show the potential involved with a simple set-up like this. I could even tell you on a 10lbs of boost pull my kid's car made 291rwhp. I didnt post 291rwhp because the engine went lean and that is not a realistic goal/tune..

the car made back to back 280rwhp @ 9psi of boost with the proper A/F ratio, and that jack is the facts believe it or not..

here i'll post some pics her clutch with tons of heat spots from slippage.. I hope you know how to read a slipping clutch.. so sit back relax and enjoy the progress on this simple but effective build..

by tomorrow morning the new clutch should be installed and change fluids and leave it ready for the evening. i'll try to have some video footage..

It seems incredibly unlikely that that's the real hp. I'm hoping you prove me wrong and I'm not having a go but I have seen so many hp claims that don't back it up at the track, and thats what this looks like, not so much concerned with the ecu, but I am aware of how inefficent the stock turbo is. And as for the clutch slip it cannot be that bad to do a 1.8 sec 60ft. Back to my 13.5 @104 on 220hp was with a 2.0 60ft, on a better track/tyres my 60ft time would be improved thus my et and mph would have changed.

At the end of the day if I see it pulling mid 12's at 110+ mph I'll shut my mouth and give credit where credits due as this is quite an achievement.

even if you improve to a 1.8 60 ft mark your car will NOT pick up half a second in the big end.. and your wrong again, when any car improves 60ft mark, the E.T. improves but the mph will not(basically the quarter mile is driven in a more efficient way) and if you think the clutch was not bad enough according to all the heat shown from slippage then you have very limited experience in the world of drag racing..

and your wrong again with saying it should trap 110mph, before you make any assessment, the weight/hp needs to be known. and in this case you DO NOT KNOW how much the car tips the scale with the driver.

according to the weight of the car and the 280rwhp the car should trap 106.22mph..

with 292rwhp it should trap 108mph

and with 311rwhp it should trap 110mph ofcourse any of this is assuming the car will have good traction and driven efficiently..

I'm just assuming 60 more rwhp picking up more mph then my 220ho car. As for the weight my car is probably heavier then stock by a little bit and I weigh 106kg so I doubt your heavier. As for mine taking .2 off my 60ft would probably take .4 or so off my et putting me at around a 13.1 and I'm sure it could have hit 1mph extra with some extra traction. Also if your clutch is that fucked you should even gain some rwhp on the dyno with a new one. I'm still not able to see 280hp. And picking up an extra 11rwhp gain going to 10psi on the stock turbo seems incredible to me given how inefficient they are up high.