Discussion: blacktop 20v: the road beyond 200HP

[86er]

Ok Ive started this topic on 3 other forums u can follow them here
http://www.toymods.net/forums/showthread...post346646
http://www.hachiroku.net/forums/showthread.php?t=3356
http://www.ae86drivingclub.com.au/forum/...id=303313&
some nice info posted especially on the toymods forum

Now everysince I got on the 20v blacktop craze and started the swap I've been troubled, when guys first started megasquirtin these I was impressed by the resulting figures and it made sense to venture this road as a stock BT with open stacks, exhaust, and MS weregetting from 140-150ish at the wheels which i thought was great something a 16v honestly needs alot of work to acheive (not saying it cant reach that level) cuz i know better havin had 2 bigports before which were relatively stock. fter "jumpin on this band wagon" i started doin all kinds of research into modding the 20v further I discovered that after market support for the 20v pretty much suscks and honestly there is a huge Gray cloud surrounding the 20v and modding it WORLDWIDE!!!! Thats what all my research has led me too I dont think people truly realise the potential of the engines, But i must admit I myself am not sure of that FULL potential either, but nly few have tried and succeeded. Some would quckly jum to say that the Japanese have preoven the limit of the 20v but my findings lead me to suspect otherwise.

Anyway the purpose of this topic is to discuss and truley try to discover the potential of the blacktop mainly, the silvertop will also be covered as it applies at this level of tuning, but until u pic down the head and start fixing it it honestly doesnt compare to a blacktop. The latter silvertop is better though and closer to Blacktop.

So firstly my findings, below i will post linnks to various forums where either people have sucessfully developed th 20v or have thoroughly tested it in terms of mods and power gains to a point

WheelsJamaica.com these guys have truley proven with what are some very lengthy topics (one 25+ pages) what a 20v blacktop is made of and how well the stock motor responses to the right mods

http://www.wheelsjamaica.com/wheels_foru...ic=12990.0

http://www.wheelsjamaica.com/wheels_foru...c=32929.40

http://www.wheelsjamaica.com/wheels_foru...ic=45443.0

http://www.wheelsjamaica.com/wheels_foru...ic=44599.0

there is a wealth of info in above links and real info instead of guessin
Now that confirms that a stock blacktop with proper velocity stacks, headers, and exhaust will produce around 140WHP now the test car is fwd which is probably why with same mods and a megasquirt people get 145ish-150whp as we have more drivetrain loss.

SO at 20% drivetrainloss people seem to average on a ae86 145whp is like 174 at crank. That to me is very impressive and motor has even been open yet.

Now this guy in Aussie has a very impressive BT

20v_KE25 Wrote:this is my KE-25 race car which is used mainly for club sprints. I bought the car for $300 through work as a trade in. it started off as a granny spec. 1200 which was quickly converted into a 4AGE 16 valve RWD with T50 and AE-86 disc break rear end with TRD lsd. Front brakes are series 4 RX7 with Saab 280mm rotors. The rears are 300ZX turbo with MX-73 rear discs. About 4 and a half years ago I decided to make the move up to a Black top 20 valve with a TRD close ratio gear set. The engine is still currently running stock ECU and has proven to be both reliable and very competitive, it hasnt lost a race in my class in about 4 and a half years and it holds the lap record for my class at Philip Island with a 1:54.33. At the recent Chasers dyno day organised by Glen (Celica RA45) it pulled out 121.4KW's at the rear wheels!! Here are some photos, doesn’t look too special to the eye but it does the job.













"At the recent Chasers dyno day organised by Glen (Celica RA45) it pulled out 121.4KW's at the rear wheels!!"

that car is pumpin out over 190crank hp when you work it out. which is impressive with short mod list, my only explaination for his figures is one the race gas and 2 the electric water pump. But hell when i think about it JAPANESE n2 cars with fully built 20vs are usually said to be 200PS or so with same race gas, usually high duration cams high comp pistons, management, steel cranks etc etc. :confused:

Here in is where my problem with the japanese 20v developmant lies

example Tysuchia's(spellin) 86 has a trd bild blacktop with full exh management, wasted spark, and i think 272/288 cams high comp miata pistons(use to have toda) and tuning tunin and they CLAIM his touge car is 170PS thats bull i dont see anyway that car could be less tha 200hp based on all figures the assuies/americans and the rst of us are gettin. Thats less than what can expect on stock motor with a Megasquirt and bolt ons.