Ok, I was wanting to do a quick fix on my d15. In about 8 months, I'm getting a 7,000 dollar bonus from the air force, but I want something fun to play with until then. I was thinking about swapping the intake manifold to MPFI, and maybe the homemade cheap turbo setup like they did in some magazine that I just read in. Just need to hear some of ya'lls advice.

 

ya do that, itd be fun and cheap then when you get your bonus buy all the good stuff and get a B series swap,

Blaze

 

yeah, I was planning for an LS swap in the future.

 

If ya need any help check out my website, we got a site and forum full of that bullshit homemadeturbo stuff

Non-Profit btw,

http://www.homemadeturbo.com



[Modified by AbaZ, 11:45 PM 3/23/2003]

 

ya do that build up and just wait for your bonus to come in, i have a dx 1.5 with mpfi and i have been beating LSs with intake and exhaust like it was nothing.

i just have i/h/e some small stuff and a chipped ecu, ecu for a stronger fuel map and higher timing curve, and i have a 8200rpm rev limiter, at 7700 the car is not running lean at all, its just perfect


[Modified by mattED6, 9:48 AM 3/25/2003]

 

what are your 1/4 miles times w/ that setup?

 

i dont run quarter mile, i do road race and autocross

 

Do you take it to 7700 with stock internals or is it build? I was wondering how stock internals will hold with a higher rev limiter.

 

i'd rock a d15 i've got a block in my garage that might get a vtec head in the future.

 

i have only taken it to 7700 a couple times, the motor isnt built still running everything stock for right now, but i see cryo pistons and rods in my future

 

aparently, all d series blocks are operable up to 7500rpms w/o problems. however condition of motor comes into play. d16z6 i guess is ran up to 7500rpms. evidently all d series rod design, berring design etc etc etc etc are very very identical. (obviously some rods are longer than others etc but in general they are all able to withstand 7500rpms w/o a problem).

valvetrain is a different situation. id asume a d16a6 could do 7500rpm w/o much problems in the future. a bone stock d15b1 or b2 prolly could not (imo) b/c of the differences in valvetrains. zc's will pop @ 8K. i know my d15 pulls beyond 7krpm (makes power after that actually.) but is limated to 6800rpm. im throwing a different ecu in the future and winding it out to 7500rpm and seeing how the engine responds to it. hopefully all goes well. it should

i HIGHLY reccomend you do not bounce your d series off the rev limater at these rpms. get a MSD 6AL w/ soft touch rev control and regulate your "redline" by that. it drops spark instead of fuel eliminating the whole leaning out biz that will kill your motor.


[Modified by limoZeen, 10:05 PM 3/25/2003]

 

im getting my MPFI in the next week or two and going to have a pg7 with a higher redline and was just wondering how well my engine will take going up to 7200 once in every full moon. I just dont want to tear my engine up just testing it out. Anybody tried it with their stock d15b

 

im sure it wont have any problems doing so. i highly reccomend swaping the si cam and valvetrain over. cam is 3489578345834 times nicer and the valvetrain is slightly stronger. it prolly cheaper and less effort just doing an si head swap. (same head as what you currently have but diff valvetrain etc). that way you dont have to rebuild the head.

si cam vs STD cam = STD 4spd trans vs si 5 speed trans = dpfi vs mpfi all over again

 

About how much will it be for new Si valvetrain in my DX head? also do both the Si and DX heads have the same flow characteristics?

 

ya my car is still making power at 7700 rpms (its a d15b2) i still have the stock dx cam in because the cam timing woulda been way to advanced without a cam gear to adjust it by. but then again i have my ecu specifically programmed with more fuel in the top end to decrease chances of detonation and valve float

edit: stock2the bone i have a si head that needs to be rebuilt i will sell it for like i dont know shoot me an offer


[Modified by mattED6, 8:30 PM 3/25/2003]

 

dunno about the valvetrain. the complete head should run about 50-75$. all dx, STD, SI heads are exactly the same except for the valvetrain and cam. they flow the same etc.

 

well being like one of the first on this site to have done this besides tortexal i think we did it at the same time both to our 88 std d15b1s slightly different setups but about the same outcome....mine i started out with just the a6 intake std head and pm6 ecu and a new exhaust care of a dx cause the 88 std exhaust is similar to a HF where the cat is up at the head....from there i got a d16y7 (99dx) head flows way better than an A6 head makes power above 4 grand and it has smaller combustion chambers than the a6 and d15b1 (same heads just different valve trains)...got a y8 head gasket and a z6 intake mani and LS throtle body.....and now have header and a 93 integra exhaust very big piping compared to the dx and and intake....no cat....with a dx trans it did best of 15.2 with a 2.1 i think 60 ft.....now with a lil tuning and some drag radials i could have gotten it to a 14.9 im positive about that ALs car d15b a6 P&P shaved i belive afc on it and ihe his makes a lil more power with the P&P and i think he has a cam and the heads shaved a bit....and keep the dx trans if u wanted to get a si trans dont not worth it gears are toooo short and limit the use of the power ur making trust me on that i put a si trans in and i went to a 15.7 1.4 time witha 2.4 60 ft...it accelerates to quick and the d15 somehow makes alot of toque with the mpfi swap.....btw i leave for bms in 3 weeks for the air force also good luck with the swap its not hard at all just takes some time and patience have everything ull need for it if u dont care about it dont bother with a head or valve train not worth it if u gonna toss it in a few months the mpfi by itself will be fine...

 

im trailering everything out there and we're running who cares if im clutchless!

ive never personally tried the dx trans. however, im trying to make up for a lack of gear w/ an increased reline. si trans does have really short gears, your top end is mabey 120mph. the 4speed std sucks *** besides 2nd gear from a roll at 40mph. you can take it up to 70 in 2nd. 3rd gear in the si seems to be a bit crappy. ive never had the chance to experiment with this like Dom has. he'd know epecially if he has the times to back it up.

keep in mind my car only weighs 1715lbs. what i dont make in power is made up w/ my anorexic car. Dom has a full interrior i believe. the D15 block definitelly have a lot of potential. its just a matter of how far you want to go w/ it. its more of a "how fast can i make this 1.5L go" than "im trying to beat up on X w/ it"
its a lot of trial and error with these motors. right now i have no low end. dunno if its a result of my non advanced timing, no clutch, fuel issue combo of all (prolly is)or what. 5K rpm feels like vtec kicking in tho, its really weird. whcih is another reason id like to have a higher redline. i can only utilize 5000-6800rpm. imo if i had a dx trans i couldnt keep my R's up that high while shifting.

if you really want to make these motors go, imsure you will break your fair share of parts in the process cant speek for Dom, but ive broken so much **** its unbelieveable. Pressure plate, axle, shift linkage (hapened today), motor mounts, valves, distributers, spark plugs. you name it, its been broken. never snapped a timing belt tho


blah if you want to go crazy w/ these motors like we did, have fun. otherwise the mpfi swap alone (like dom said) is plently fun for a while untill you do a swap.

 

ive solved the motor mount issue with poly inserts they work great and help with wheel hop....with the dx trans if u shift fast enough u can keep the rpms up in a good range....and yeh full interior and my fat **** was 205 now im down to 172 hard to belive but maybe ill race this bitch as soon as i can get a new axle cv joint is gonna go anytime now

 

I have the D15B1 in my 91 hatch and the D15B2 in my 88 CRX...the CRX feels much stronger,I guess because of the lighter weight and 20 HP gain.I'm not wasting my time or money on my D15B1...have you seen the rods in these?My old 89 Integra with the D16A1 had some beefy rods compared to the D15's...you can get a ZC or D16Z6/D16Y8 SOHC VTEC swap cheap so I'd just do that.Unless you just wanna blow something up,which might be fun,seeing those skinny little rods flying through the block!